Answer:
They have the same or similar properties as the materials used to make them.
Explanation:
What type of heat transfer occurs in solids?
Answer: Conduction
Explanation:
The atoms in the solid move together and create heat
Answer:
conduction
Explanation:
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A cat sees its his favorite human come in the door and runs toward him. the cat starts with a velocity of 4.94 m/s and slows to a velocity of 1.78 m/s in 1.25 seconds.
a) Calculate the cat's average acceleration.
b) Calculate the cats displacement.
Answer:
Average acceleration =-2.53m/s^2
Displacement s = 4.2m
Explanation:
24 grams of magnesium metal reacts with 16 grams of oxygen gas to form magnesium oxide. according to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?
The mass of magnesium oxide must be 40 grams
Explanation:
The law of conservation of mass states that the total mass of the reactant in a chemical reaction must be equal to the total mass of the products after the reaction has completed.
In this problem, we have:
Reactants:
Magnesium metal (mass: 24 grams)
Oxygen gas (mass: 16 grams)
Products:
Magnesium oxide (mass: ?)
According to the law of conservation of mass, the mass of the magnesium oxide must be equal to the sum of the mass of the magnesium metal and the oxygen gass. Therefore:
Mass (magnesium oxide) = 24 g + 16 g = 40 g
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A 10-newton box rests on a table. What is the net force on the box? A. 0 N B. 10 N C. more than 10 N D. between 0 N and 10 N
A. 0 N is the net force acting on the box
Explanation:
Newton's first law of motion gives an insight to this problem, if an object stays in its position of either motion or rest, it can only change its current of either motion or rest is by applying an external force on it. If an object is resting on a table, there is a normal force acting perpendicular to the object and at the same, there is the gravitational force acting on the object in the perpendicular direction opposite to the direction of the normal forceHence, these two forces cancel and the resultant force will be zero. so it is in rest and it moves only when the resultant force is non zero.A boy that has a mass of 40 kilograms is walking at a speed of 2m/s. What is the boys momentum?
Answer:
The boy's momentum = 80kgm/s
Explanation:
Momentum (P) =mass x velocity
Where, velocity(speed) =2m/s
Mass of the boy=40Kg
Momentum (P)=(40kg) x (2m/s) = 80kgm/s.
Which statement is true about air pressure acting in an object
Answer:
According to your question although you didn't include the options, it is obvious that when air pressure is acting on an object ,there is just as much air pressure pushing up as there is pushing down on the object,thereby creating a balanced for the object.
Place the two thermometers outdoors in different locations. Place one in direct sunlight and the other in shade. Make sure that the thermometers are in a secure location so they will not fall or blow away. Do you think that there will be a difference in temperature between these two locations over a period of one week? Write down your prediction.
Answer:
YES THERE WILL BE A DIFFERENCE
Explanation:
THE THERMOMETER WHICH IS KEPT UNDER SUNLIGHT WILL BREAK DUE TO THE HEAT OF THE SUN
AND THE ONE KEPT UNDER SHADE WILL BE SAFE.
Final answer:
Yes, there will likely be a difference in temperature between a thermometer placed in direct sunlight and one placed in the shade due to the energy carried by sunlight that converts to heat when absorbed.
Explanation:
If a student places one thermometer in direct sunlight and another in the shade and records the temperatures over a period of one week, yes, there will likely be a difference in temperature readings between the two locations. Direct sunlight warms the surface it strikes more than an area in the shade does. This is due to the fact that sunlight carries energy which converts to heat when it is absorbed by objects, including thermometers. If the thermometer in the shade is shielded from this direct infusion of solar energy, it will generally record a lower temperature.
Several experiments suggested, such as shielding a thermometer with aluminum foil, wrapping it with a handkerchief soaked in nail polish remover, or simply measuring the air temperature in a sunny spot, all showcase the effects of sunlight on temperature readings. It is important to use an appropriate laboratory thermometer that can handle specific temperature ranges to avoid breakage and ensure accurate results. Additionally, when conducting the experiment, it is vital to ensure that the thermometer is upright to avoid incorrect readings.
Generators may be set up to produce either direct or _____ current
Answer:
Generators may be set up to produce either direct or alternating current
Explanation:
A 0.250 kg mass is attached to a spring with k=18.9 N/m. At the equilibrium position, it moves 2.89 m/s. What is the amplitude of the oscillation? (Unit=m)
Answer: y = R*sin(2.75*t - δ)
Here δ is just the time offset and for our purposes is pretty irrelevant. You can in fact set it to zero since we can say we begin timing when the mass crosses equilibrium. So
y = R*sin(2.75*t)
We want to find a way to use the information "At the equilibrium position, it moves 2.89 m/s." I am going to use some calculus here since it makes things so much easier. If you haven't taken calculus yet, most likely your course has given you a formula to use instead.
We know y=0 when t=0, so y is at equilibrium when t=0. To say it moves 2.89 m/s is then to say that
y'(0) = 2.89.
From here we can differentiate the displacement function, set t=0 and solve for R. Using the chain rule:
y'(t) = 2.75*R*cos(2.75*t)
y'(0) = 2.75*R
2.75*R = 2.89
R = 1.051
Explanation: Since this is harmonic motion we can assume there is no damping force. The frequency of the oscillation is given by ω=√(k/m)=√(18.9/2.5)=2.75. Keep in mind this is angular frequency, i.e. radians per second, not wavelengths per second.
The table below shows two types of electromagnetic waves and three random applications of electromagnetic waves.
Type of Wave Application of Waves
Microwaves 1. Show the heat released by astronomical objects
Infrared waves 2. Study stars having high temperature
3. Measure temperature differences in space
Which of these best matches the waves with their applications?
Select one:
a. Microwaves—3 and infrared waves—1
b. Microwaves—1 and infrared waves—3
c. Microwaves—1 and infrared waves—2
d. Microwaves—2 and infrared waves—1
Answer:
a. Microwaves—3 and infrared waves—1
Explanation:
Microwaves and infrared waves are both part of the electromagnetic spectrum, but they have different frequency and wavelength.
In particular:
- Microwaves are long-wavelength electromagnetic waves, with wavelength between 1 mm and 1 m. Their wavelength is longer than visible light
- Infrared waves are also long-wavelength electromagnetic waves, but their wavelength is shorter than microwaves: between 700 nm and 1 mm. Their wavelength is also longer than visible light.
The two types of waves are also used for different purposes. In particular:
- Infrared waves are emitted by any hot object, and their intensity depends on the temperature of the object. Therefore, they are used in astronomy to show the heat released by astronomical objects (option 1)
- Microwaves are used to study the Cosmic Microwave Background (CMB). This is electromagnetic radiation that permeates the whole universe, and its wavelength depends inversely on the local temperature. Therefore, areas with longer wavelength have lower temperature, and viceversa. Therefore, microwaves are used to measure temperature differences in space (option 3).
How does slope on this graph indicate the amount of density?
Density comparison
Question 3 options:
A higher density is indicated by a slope that is not steep (yellow line)
The line in the middle (red line) has the highest density
The steeper slope (green line) indicates a higher density
Final answer:
The slope of a line on the graph represents the amount of density. A steeper slope indicates a higher density, while a flatter slope indicates a lower density.
Explanation:
The slope of a line on the graph represents the amount of density in this scenario. A steeper slope indicates a higher density, while a flatter slope indicates a lower density.
For example, in the given graph, the steeper slope (green line) indicates a higher density, while the slope of the yellow line is not steep, indicating a higher density as well.
Therefore, the statement 'The steeper slope (green line) indicates a higher density' is correct.
How do you make an electromagnet
Answer:
The correct answer is D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.
Explanation:
What effect does Earth’s spherical shape have on the amount of sunlight that reaches the equator?
A.
The latitudes near the equator receive direct sunlight, which causes a high-pressure system.
B.
The latitudes near the equator receive indirect sunlight, which causes a low-pressure system.
C.
The latitudes near the equator receive direct sunlight, which causes a low-pressure system.
D.
The latitudes near the equator receive indirect sunlight, which causes a high-pressure system.
A
Explanation:
The earth is spherical. So it's middle part is bulgjng outside. So more sunlight will be incident on the latitude near the equator. This will heat the air and it will rise up. This will cause high pressure difference and polar disturbances.
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The Earth's spherical shape ensures that the equator receives the most direct sunlight, resulting in higher temperatures and a low-pressure system due to the rising warm air. This leads to the high precipitation in the equatorial region and plays a significant role in global atmospheric and oceanic circulation patterns.
The spherical shape of the Earth influences the way sunlight is distributed across different latitudes. At the equator, the sun's rays are most direct, resulting in a higher concentration of solar energy and higher temperatures. This intense sunlight is focused on a smaller area, leading to the warm conditions that are characteristic of equatorial regions. Due to the heat at the equator, the air warms up, becomes less dense and creates a low-pressure system.
As a consequence of the heat and low-pressure conditions, there is significant convection, which causes air to rise. This is part of the reason why the equatorial region, also known as the Intertropical Convergence Zone, is often characterized by high precipitation levels. The rising warm air can lead to cloud formation and frequent rainfall. In contrast, at higher latitudes, the sun's rays strike the surface at a more oblique angle, spreading the energy over a wider area and resulting in cooler temperatures and different atmospheric conditions.
Therefore, the correct answer to the question is: C. The latitudes near the equator receive direct sunlight, which causes a low-pressure system.
A lump of steel of mass 10kg at 627 degree Celsius is dropped in 100kg oil at 30 degree Celsius . the specific heat of steel And oil are 0.5kj/kg.k and 3.5kj/kg.k calculate the entropy change in steel,oil and in the universe.
Answer:
700J
Explanation:
Two forces whose resultant is 100N,are perpendicular to each other.if one of them makes an angle of 60° with the resultant, calculate it's magnitude
Calculate the absolute pressure of an ocean depth of 1200atm. Assuming the density of liquid is 1200kg/m^2amd that (pa=1.01×10^6pa N/m^2
Magnitude of the force = 50N
Explanation:
Let one force be X
And the second force be Y
Both the forces are perpendicular, so α = 90°
The resultant R of the two forces = 100N
Angle between resultant and 1 force, α = 60°
We know,
R² = X² + Y² + 2XYcos 90
100² = X² + Y²
If X makes an angle of Φ = 60°
Then, tan Ф = Y sin α / X + Y cos α
Putting the values we find,
tan 60 = Y/X
Y = √3X
Putting Y = √3X in equation 1 we get,
(X)² + (√3X)² = 100 X 100
4X² = 100 X 100
X² = 2500
X = 50N
Therefore, magnitude of the force = 50N
Directions: Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts of potential and kinetic energy the bowling ball has:
• as it sits on top of a building that is 40 meters tall.
• as it is half way through a fall off a building that is 40 meters tall and travelling 19.8 meters per second.
• as it is just about to hit the ground from a fall off a building that is 40 meters tall and travelling 28 meters per second.
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4. What is the potential energy of the bowling ball as it sits on top of the building?
5. What is the potential energy of the ball as it is half way through the fall, 20 meters high?
4) Potential energy: 784 J
5) Potential energy: 392 J
Explanation:
4)
The potential energy of an object is the energy possessed by the object due to its position in the gravitational field. It is given by
[tex]PE=mgh[/tex]
where
m is the mass of the object
g is the acceleration of gravity
h is the height of the object from the ground
Here, for the ball sitting on top of the building, we have:
m = 2 kg (mass)
[tex]g=9.8 m/s^2[/tex] (acceleration of gravity)
h = 40 m (height of the builiding)
So, the potential energy is
[tex]PE=(2)(9.8)(40)=784 J[/tex]
5)
As the ball is half way through the fall, the height of the ball is
h = 20 m
The potential energy of the ball now is
[tex]PE = mgh[/tex]
where
m = 2 kg is the mass of the ball
[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity
Therefore, the potential energy now is
[tex]PE=(2)(9.8)(20)=392 J[/tex]
And we see that the potential energy has halved: this is because part of the potential energy, during the fall, has been converted into kinetic energy, increasing the speed of the ball (which is in fact accelerating).
Explain in detail what information can be learn about atoms of different elements by examining the periodic table . For the Maximum Points Earned, You Should Include the visible information on the periodic table as well as trends of the Atoms (size, energy level, valence electrons, etc)
Answer:
We know the information about atomic size, energy, electronic configuration etc. of atom from the periodic table.
Explanation:
Periodic table is the arrangement of elements that are arranged according to their properties and electronic configuration.In periodic table, on furthest right side of the periodic table, noble gases like He, Ne, Ar etc are arranged.The atomic number of element increases while moving from left towards right in the periodic table.The metallic character of element decreases as we proceed the table towards right.They readily accept electron to fill the valence shell hence becoming more metallic in character.Imagine that Kevin can instantly transport himself between Planet X and Planet Y. Which statement could be said about Kevin in this situation?
Kevin’s weight may change between Planet X and Planet Y.
Kevin’s volume may change between Planet X and Planet Y.
Kevin’s mass may change between Planet X and Planet Y.
Kevin’s matter may change between Planet X and Planet Y.
The answer is Kevin's weight may change between Planet X and Planet Y.
Explanation:
The mass is the amount of matter contained in our body and it does not vary with other planets (remains constant). But the weight on the planet is the strength of gravity on the planet and result of mass which will vary with different planets. Your weight is a measure of the pull of gravity between the person and the planet.Every object in the universe will attract each other object with the same mass. When the gravity is high, your weight will be high because your weight will be depending on the gravitational pull of planets.For example, if an astronaut travels from Earth to Mars, his mass remains unchanged and he floats with the same size and mass but his weight will vary due to varying gravity. Thus your mass doesn't affect other planets it's only the weight that may change due to the varying gravitational pull or no gravity.Answer:
the answer is A
Explanation:
A jet plane manages to go forward by sucking in_____
through the_______
and shooting it out again at the back. (Note: one word for each field)
QUESTION 3
In terms of the action-reaction law, what is the reason why firemen have difficulty holding on to the nozzle of a fire
hose when water is gushing out at high speeds?
The hose's material contracts (action) resulting in a recoil (reaction)
It is an electrically regulated jolt (action) as a build-in feature for safety purposes, so that firemen recoil back
(reaction) from potential flares
The force by which the water is shot out (action) results in an equal counter-force by the water (reaction)
The water hitting on a heavy object or surface (action) results in a counterforce from the object or surface
conducted through the water to the firemen (reaction)
The push-back is only a perceptional effect from the stress which the firemen experience
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Answer:
sucking in air through the turbine.
Explanation:
When an airplane turbine operates, it sucks air through it, compresses the air, causes its pressure to increase in the same way as its temperature and ejects it at high speed through the nozzle-shaped output, creating a high output speed and push force capable of moving the plane horizontally.
Vehicles of the fire department are equipped with water pumps of high pressure, in such a way that, when operating, send a flow of water with high pressure and speed through the hose, this force output of the water is sometimes much greater than the force with which the fireman holds the hose, and hence the difficulty to maneuver the hose.
Now when the fireman points the hose with the water at high pressure and speed coming out of it, into a wall close enough. The Fireman will experience newton's third law in all its splendor, which says that every force of action leads to a reaction, so that the reaction could hurt the fireman operating the hose.
10,500 J of GPE, weight 539 N, how tall is the hill you are sitting on?
To calculate the height of the hill, use the formula h = GPE/Weight with the provided gravitational potential energy (10,500 J) and weight (539 N) of the object. The height equals the GPE divided by the weight, which, upon calculation, gives the height of the hill in meters.
The student is asking how to calculate the height of the hill, given the gravitational potential energy (GPE) and the weight of an object. In physics, the formula to calculate GPE is GPE = mgh, where m is the mass of the object, g is the acceleration due to gravity (approximately 9.8 m/s2 on Earth or 10 m/s2 for simplified calculations), and h is the height.
To find the height, one can rearrange the GPE formula to solve for h, which gives us h = GPE/(mg). The weight of an object is the force due to gravity acting on it, which can be calculated by multiplying the mass by the acceleration due to gravity (Weight = mg). Given that the weight (Weight) of the object is known, we can simplify the formula for height to h = GPE/Weight.
Using the information provided by the student, the GPE is 10,500 J, and the weight is 539 N. Substituting these values into our height formula gives us h = 10,500 J / 539 N, which results in an answer after calculation.
Let's calculate the height:
GPE = 10,500 J
Weight = 539 N
Height h = GPE / Weight = 10,500 J / 539 N
=19.48
What is the area of shore between high and low tides called
Its is called intertidal zone
Explanation:
The earth rotation and the moon's pull of gravity causes the tides to rise and fall.High tides occur when the water advances to the furthers point of a shoreline where as low tides happen when the water recedes to the lowest point of the shoreline.Some kinds of animal and plants survive in the ecosystem present between the area of high tides and low tides refered to as the intertidal zone.This area is sometimes covered or uncovered by ocean waters.
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definition of motion?
Answer:
the action or process of moving or being moved
Explanation:
Answer:
Motion is simply the change of position of an object with time
Explanation:
a 3kg has 9 joules of kinetic energy how fast is it flying
Answer: 2.4 m/s
Explanation:use KE= 1/2 mv²
Derive to find v:
v = √ 2KE / m
= √ 2 ( 9 J ) / 3 kg
= 2.4 m/s
How is instantaneous speed calculated?
Answer:
Explanation:
Instantaneous speed is the speed of an object at a given point of time. While the speed we usually calculate is the average speed of the object throughout its journey, instantaneous speed can be determined by calculating the derivative of the average velocity of the object in question.
And the formula for average velocity is
V(avg)= Metre/ second, which is distance/time
Hence its derivative would be
dV(avg)=d(Distance)/d(time) which is the instantaneous speed of the object
Final answer:
Instantaneous speed is calculated by taking the absolute value of instantaneous velocity, which is the magnitude of velocity at a specific moment in time, without considering direction.
Explanation:
The calculation of instantaneous speed requires understanding that it is the magnitude of instantaneous velocity. Instantaneous velocity is a vector quantity that has both magnitude and direction, but when we are interested in the speed at an exact moment in time, we disregard the direction. To calculate the instantaneous speed, one typically takes the absolute value of the instantaneous velocity. For instance, if an object has an instantaneous velocity of -3.0 m/s, indicating motion towards the rear of a plane, its instantaneous speed is 3.0 m/s. Unlike average speed, which is calculated by dividing the total distance traveled by the total time taken, instantaneous speed is concerned solely with the rate of motion at a particular instant.
Instantaneous speed is a scalar quantity and, unlike velocity, does not include any directional information. The instantaneous speed can be determined from the instantaneous velocity by simply looking at its magnitude, without regard for its direction.
A cart being pulled with 30N through a 2 m hallway over two seconds. How does it have the greatest power exerted on it
Answer:
Power = 30 [watts]
Explanation:
Initia data:
F = force = 30[N]
d = displacement = 2 [m]
By definition we know that work is equal to the product of force by the distance displaced
Therefore:
W = F * d = 30 * 2
W = 60 [J]
And power is defined as the amount of work done in a given time interval
time = t = 2 [sec]
Power = W / t
Power = 60 / 2
Power = 30 [W]
The ability of atoms to attract electrons in chemical bonds is called
________.
A. swarming
B. ionization energy
C. electronegativity
D. electronic shielding
Electronegativity is the ability of atoms to attract electrons in chemical bonds. It is an important concept in predicting bond types and molecular properties.
Explanation:The ability of atoms to attract electrons in chemical bonds is called electronegativity. Electronegativity is a measure of an atom's tendency to attract a shared pair of electrons towards itself in a covalent bond. It is influenced by factors such as the number of protons in the nucleus and the distance between the nucleus and the outermost electrons.
For example, in a molecule of water (H2O), oxygen (O) has a higher electronegativity than hydrogen (H), resulting in a polar covalent bond where oxygen attracts the shared pair of electrons more strongly.
Electronegativity is an important concept in predicting the types of chemical bonds (such as ionic or covalent) and the polarity of molecules, which in turn influences their physical and chemical properties.
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if it takes 3.5 hours for the hogwarts express moving at a speed of 120 mi/hr to make it from platform 9 and 3/4 to hogwarts how far apart are they?
The distance travelled by the Hogwarts express is 420 miles. So, they are 420 miles apart by the Hogwarts express .
What is speed?Speed is characterized as the rate at which an object's position changes in any direction. The distance travelled in relation to the time it took to travel that distance is how speed is defined.
Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
Speed of the Hogwarts express is = 120 mi/hr.
Time interval the Hogwarts moves = 3.5 hours
Hence, The distance travelled by the Hogwarts express is = speed of the Hogwarts express × time interval the Hogwarts moves
= 120 mi/hr × 3.5 hr
= 420 miles.
So, they are 420 miles apart by the Hogwarts express .
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The distance between platform 9 and 3/4 and Hogwarts is 420 miles.
Explanation:To determine the distance between platform 9 and 3/4 and Hogwarts, we can use the formula distance = speed × time.
Given that the Hogwarts Express is moving at a speed of 120 mi/hr and takes 3.5 hours to reach Hogwarts, we can calculate the distance as follows: distance = 120 mi/hr × 3.5 hours = 420 miles.
Therefore, the distance between platform 9 and 3/4 and Hogwarts is 420 miles.
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What are the results of inserting a crimp connector into the crimp tool facing the wrong way ?
If you insert a crimp pin incorrectly, the ratcheted crimp tool will not sufficiently crimp the tabs. As a result, the wire may not fully conduct with the pin and the pin will be damaged.
Explanation:
The general theory for crimping all types of connectors is to strip a little bit of insulation off the wire. Then, put the connector into a suitably sized space in the jaws, insert the wire, and crimp it down. For non-ratcheting pliers, it's suggested the connector be re-crimped with the next smallest hole in the jaws.
A good crimp connection is gas tight and won't wick: it is sometimes referred to as a “cold weld”. Like the solder method, it can be used on solid or stranded conductors, and provides a good mechanical and electrical connection.
Inserting a crimp connector into a crimp tool incorrectly can lead to poorly fastened connections, resulting in signal loss, intermittent connectivity, or failure of the electrical connection and may create a safety hazard.
Inserting a crimp connector into a crimp tool facing the wrong way can result in a poor connection as the connector will not be properly fastened to the wire. The specific results depend on the type of crimp connector and tool, but generally, you may end up with a connector that is not adequately compressed, leading to signal loss, intermittent connectivity, or complete failure of the electrical connection. Additionally, it increases the risk of short-circuiting or creating a potential safety hazard since the contact between the conductor and the terminal may not be secure.
She sights two sailboats going due east from the tower. The angles of depression to the two boats are 42o and 29o. If the observation deck is 1,353 feet high, how far apart are the boats?
Answer:
The boats are 934.65 feet apart
Explanation:
Given:
The angles of depression to the two boats are 42 degrees and 29 degrees
Height of the observation deck i = 1,353 feet
To Find:
How far apart are the boats (y )= ?
Solution:
Step 1 : Finding the value of x(Refer the figure attached)
We can use the tangent ratio to find the x value
[tex]tan(42^{\circ}) = \frac{1353}{x}[/tex]
[tex]x = \frac{1353}{tan(42^{\circ}) }[/tex]
x = 590.47 feet
Step 2 : Finding the value of z (Refer the figure attached)
[tex]tan(29^{\circ}) = \frac{1353}{z }[/tex]
[tex]z = \frac{1353}{tan(29^{\circ})}[/tex]
z = 1525.12 feet
Step 3 : Finding the value of y (Refer the figure attached)
y = z -x
y = 1525.12 - 590.47
y = 934.65 feet
Thus the two boats are 934.65 feet apart
14. Which of the following is an example of changing acceleration?
a. A car stopped at a red light.
b. A boat sailing west at 5 knots.
c. A train traveling 65 miles per hour south.
d. A man jogging 3 meters/second along a winding path.