The heat required to change 1.25 kg of steak is 2825 kJ /kg.
Explanation:
Given, mass m = 1.25 kg, Temperature t = 100 degree celsius
To calculate the heat required,
Q = m [tex]\times[/tex] L
where m represents the mass in kg,
L represents the heat of vaporization.
When a material in the liquid state is given energy, it changes its phase from liquid to vapor and the energy absorbed in this process is called heat of the vaporization. The heat of vaporization of the water is about 2260 kJ/kg.
Q = 1.25 [tex]\times[/tex] 2260
Q = 2825 kJ /kg.
How Far East have you traveled if you ran 80 meters northeast
The student has traveled approximately 56.57 meters east.
In this case, the student has traveled 80 meters in a northeast direction. To determine how far east the student has traveled, we need to find the eastward component of their displacement.
Since the northeast direction can be broken down into equal north and east components, we can use trigonometry to determine the eastward displacement.
By using the sine function, we can find that the eastward displacement is approximately 56.57 meters.
A body that goes a distance and then returns to its starting point has the same beginning and ending points. In this case, the displacement is zero, but the distance travelled is not. It is possible to have zero, negative, or even positive displacements.
Therefore, the average velocity is usually 0 when the overall displacement is zero. To gain a better understanding, keep in mind that a body's displacement is a vector, meaning it depends on its direction. Its precise definition is the object's position change rate in a given direction.
You are standing on a bathroom scale in an elevator that is not moving and it reads 600N. The elevator then moves upward at a constant velocity of 3.25 m/s. what does the scale read?
While the elevator is speeding up from zero to 3.25 m/s, the scale reads something more than 600N. But once the elevator settles into a constant speed ... whatever that is ... the scale settles back to 600N.
What is the kinetic energy of a 150 kg object moving at a velocity of 15 m/s?
25312.5 j
16875 j
50625 j
33750 j
Answer:16875joules
Explanation:
Mass=m=150kg velocity=v=15m/s
kinetic energy =(m x v^2)/2
Kinetic energy =(150x15^2)/2
Kinetic energy =(150x225)/2
kinetic energy =33750/2
Kinetic energy =16875joules
the presence of which magnetic feature best explains why a magnet can act a distance on other magnets or on objects containing certain metals
Answer:
Fields
Explanation:
The presence of a magnet's magnetic field best explains why a magnet can act at a distance on other magnets or objects containing certain metals. The magnetic field is an invisible force field that extends from the magnet, wherein other magnets or certain metals are influenced.
Explanation:The feature of a magnet that allows it to act at a distance on other magnets or on objects containing certain metals is its magnetic field. A magnet's magnetic field is an invisible force field that extends out from the magnet in a pattern similar to the pattern formed by evenly spaced, radiating lines. Within the magnetic field, other magnets or certain metals are pushed or pulled by the magnetic force. For example, if you slowly bring a piece of iron closer to a magnet, you will feel the iron being attracted towards the magnet even before it physically touches the magnet. That's the magnetic field in action.
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Which statements describe the Mercalli scale? Check all that apply.
Which statements describe the Mercalli scale? Check all that apply.
A. This scale measures seismic waves based on their size.
B. This scale rates an earthquake according to how much damage it causes.
C.This scale produces a single rating for earthquakes that reach the surface.
D. This scale uses Roman numerals to rank the damage caused by an earthquake.
E.This scale measures the magnitude of an earthquake based on the size of seismic waves.
Answer:The Mercalli scale : This scale rates an earthquake according to how much damage it causes and This scale uses Roman numerals to rank the damage caused by an earthquake.
Explanation:The Modified Mercalli scale is intended to illustrate the consequences of an earthquake, at a contracted station, on tangible characteristics, on modern fittings and human beings.
The Modified Mercalli Intensity value ascribed to a particular site subsequent an earthquake has an extra significant means of severity to the nonscientist than the magnitude because intensity assigns to the outcomes really encountered at that position. This scale is comprised of 12 growing levels of intensity, denoted by Roman numerals, arranging from gradual shaking to catastrophic impairment.
if a star 100 light years from earth is beginning to expand into a giant star how long will it take for astronomers to observe this development explain
Final answer:
If a star 100 light-years away begins to expand, it will take 100 years for astronomers on Earth to observe the event, as light from the expansion will take that long to travel the distance to our planet.
Explanation:
If a star 100 light-years away from Earth is beginning to expand into a giant star, astronomers will observe this development after 100 years. This delay is because the light from that event will take 100 years to travel the distance from the star to Earth. As light is the fastest thing in the universe, moving at over 186,000 miles per second, it is the speed at which we receive information from the cosmos. So, even if the star began to expand today, we would not be aware of it until 100 years later - when the light showing the star's expansion arrives here. This concept is similar to observing galaxies through the universe, which allows us to see them as they were when the light left them, essentially looking back in time.
If the speed of an object were to triple, what would be the increase of kinetic energy?
KE↓2=_____KE↓1
1. 1/3
2. 1/9
3. 3
4. 9
Answer:
4. 9
Explanation:
For instance, if the speed of an object becomes double, its kinetic energy changes to four times the initial kinetic energy.Similarly, if the speed of the object triples the kinetic energy becomes nine times the initial kinetic energy.
Therefore the answer is 9.
In this section of a circuit, a current of 2.5 A flows across R2. Find the current that flows across R3. Let R1= 3.0 ohm, R2= 8.0 ohm, and R3= 4.0 ohm
A. 2.5 A
B. 10 A
C. 6.7 A
D. 5.0 A
Acceleration is defined as a change in velocity over time. If a runner increases velocity
from 2 m/s to 4 m/s over a period of 20 seconds, what is her acceleration?
Answer:
a = 0,1[m/s^2]
Explanation:
First we need to indentify the initial data.
And using this kinematic equation we have:
[tex]v = 4[m/s]\\v_{0}= 2 [m/s] \\t = 20[s]\\\\v= v_{0}+a*t\\a=\frac{v-v_{0}}{t} \\a= \frac{4-2}{20} \\a=0.1[m/s^{2}][/tex]
7. What causes waves to bend?
Answer:
Refraction
Explanation:
Refraction is the change in direction of waves that occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings.
Waves bend or 'refract' when they move from one medium to another and change speed. This bending is impacted by the properties of the mediums and the angle of the incident wave. A common example is the apparent bending of a stick immersed in water, which we see as a result of light wave refraction.
Explanation:The bending of waves, whether light, sound, or oceanic, is primarily caused by a phenomenon known as refraction. Refraction occurs when a wave moves from one medium to another, causing a change in speed and resulting in bending of the wave. A typical example of this is the apparent bending of a stick when it is partially immersed in water; what we're seeing is the refraction, or bending, of light waves as they move from water to air.
The extent of bending, or refraction angle, depends on the nature and properties of the transmitting mediums and the incident wave angle. When waves cross the boundary between different mediums at an angle, one side of the wave changes speed before the other, causing the wave to bend towards the medium that slows it down.
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Which of these is changed by the Milankovitch cycles?
A) the reflectivity of Earth
B) the amount of solar energy that reaches Earth
C) the length of a year on Earth
D) the duration of seasons on Earth
The amount of solar energy that reaches Earth is changed by Milankovitch cycles.
Explanation:
Milankovitch cycles occur due to slight changes in the orbit of the Earth around the Sun. These could be changes in its eccentricity or even tilt in the axis.These cycles caused due to small changes have different effects on how much solar energy reaches the Earth and the time at which maximum sunlight is received.These cycles are very important as the amount of solar energy or sunlight reaching the Earth also affects the climate on the Earth. The ice ages are examples of such changes in the climate. They are strongly connected to the changes in the orbit of the Earth.The Milankovitch cycles affect the amount of solar energy reaching Earth through changes in Earth's orbital shape and axial tilt over thousands of years. The correct option is B) the amount of solar energy that reaches Earth.
Explanation:The Milankovitch cycles affect the amount of solar energy that reaches Earth. These cycles consist of changes in Earth's orbit and axial tilt over thousands of years. Of the options provided, B) the amount of solar energy that reaches Earth is the aspect that is changed by the Milankovitch cycles. Specifically, eccentricity, which is one of these cycles, alters the shape of Earth's orbital path from more circular to more elliptical over approximately 100,000 years. This affects the proximity of Earth to the sun during various parts of the orbit, thereby influencing the solar radiation the planet receives.
Why is it easy to get one empty cart moving but difficult to get a line of 20 empty carts moving?
Answer:
It is easier to move empty cart than of moving 20 empty carts because of surface that can affect balancing the carts in same array which makes the carts of array to move in different directions.
Final answer:
It's easier to get one empty cart moving than 20 because a single cart has less inertia and friction to overcome compared to the combined inertia and friction of 20 carts.
Explanation:
The question you've asked pertains to the subject of physics, specifically the principles of inertia and momentum. Inertia is the tendency of an object to resist changes to its state of motion. When you have one empty cart, the inertia is relatively low compared to a line of 20 empty carts. Therefore, it requires less force to get one cart moving than 20 carts because the combined inertia of all the carts is greater, hence more force is needed to overcome it.
In addition to inertia, frictional forces also play a part. Each cart adds its own frictional resistance to the total system. Thus, when you try to push 20 carts, you're trying to overcome the frictional force of 20 sets of wheels on the surface as opposed to just one. This makes it substantially more difficult to get the line of carts moving compared to just one cart.
explain how friction affects the mechanical energy of a system
Friction decreases the kinetic energy which decreases the mechanical energy.
Explanation:When two object moves one over the other, the resistance that is faced by the object is called as the friction. Any force that restricts the motion of any moving or any object that is sliding is called as friction. A kinetic energy can be considered as a non conservative energy that reduced the mechanical energy of any moving objects.
A friction can be considered as a force that resits motion of an object. When there a movement of two objects one against the other, there will be a conversion of kinetic energy into heat energy. This conversion is caused by the friction. Thus, the kinetic energy reduces the mechanical energy and they will be converted into heat energy.
Friction is a force that opposes motion, transforming mechanical energy into other forms like heat, effectively reducing the system's mechanical energy.
Explanation:Friction is a force that opposes the movement or motion of an object. In a system, when there is movement, friction comes into play. Mechanical energy is the sum of kinetic and potential energy in a system. As friction acts against movement, it transforms the mechanical energy within the system into other forms of energy, such as heat energy, which reduces the system's mechanical energy. Let's consider a sliding block for example. As the block slides, the friction between the block and the surface generates heat, thus reducing the mechanical energy (kinetic energy) of the block.
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Matter with a density that is less than water will____ when placed in a container of water?
Answer:
float
Explanation:
a less dense material will float when placed in a material that is more dense than itself. The reverse is also true, that a denser material will sink when placed into into a less dense material.
The amount of carbon dioxide released into the atmosphere is balanced by the release of:
A)nitrogen
B)carbon
C)oxygen
D)phosphorous
PLZZZZ hurry
Answer:
carbon
Explanation:
Research the potential for a large earthquake off the coast of Oregon. What are two of the biggest concerns with a large earthquake in this area?
There is a 33% chance of a large earthquake off the coast of Oregon.
The two main concerns of a large earthquake are Gas fires and Tsunami .
Explanation:
Everytime a large earthquake hits in any other part of the world, We find a small earthquake hitting off the coast of Oregon.
So scientists feel that as United States is prone to Earthquakes, the people have to be prepared for such eventualities.
The main concern for this large earthquake is, that it might lead to gas leakages at homes that can start a gas fire, which might spread. So people have to be careful and check on any gas leakages.
Such large earthquakes can also lead to tsunami waves. So people have to take precautions and evacuate, if they are near the coastline.
A bowling ball rolling at a certain speed has a kinetic energy of 12 J. What will be its new kinetic energy if it now rolls at 3 times the old speed?
The new kinetic energy of the bowling ball is 108 J,
Answer:
Explanation:
Any object in motion will experience an amount of kinetic energy. So the kinetic energy is directly proportional to the product of mass and square of velocity of the object. In the present case, the bowling ball is experiencing a kinetic energy of 12 J.
So, K.E. = 12 J = [tex]\frac{1}{2}mv^{2}[/tex]
As the ball will be having same mass, so when the velocity is increased three times of old velocity, so new speed will be 3v, where v is the old speed. Then the new kinetic energy will be as below:
New kinetic energy = [tex]\frac{1}{2}m(3v)^{2} = \frac{9}{2}mv^{2}[/tex]
Since we know that [tex]\frac{1}{2}mv^{2}[/tex] = 12 J, substitute this in new kinetic energy equation and we get
New kinetic energy = 9 × 12 J = 108 J.
Hence the new kinetic energy of the bowling ball is 108 J, when the new speed is three times the old speed,
A student measures the mass and gravitational force on one textbook. If you double the mass by using two textbooks, what would happen to the gravitational force?
the force would not change
the force would more than double
the force would less than double
the force would double
Answer:
the force would not change
Explanation:
the answer is the force would double. i just did the test and got it right!
A clear echo is heard within 0.2 seconds when a person shouts by sitting at the ridge of a hill. Calculate the velocity of sound in air. The distance between the person and the hill is 33.2 m
To calculate the velocity of sound in air using the given information, we'll use the formula:
Speed=(distance)/(Time).Therefore, the velocity of sound in air is 332m/s.
To calculate the velocity of sound in air using the given information, we'll use the formula:
Speed=(distance)/(Time)
Given:
Time taken for the echo(t) = 0.2 seconds
Distance between the person and the hill(d) = 33.2 meters
Firstly, recognize that the sound traveled twice the distance (to the hill and back) to create the echo.
So, the actual distance the sound traveled is 2×distance=2×33.2meters=66.4meters.
Next, use the formula for speed:
Speed=(distance)/(Time)
Speed=(66.4m)/(0.2s)
Speed=332m/s
Therefore, the velocity of sound in air is 332m/s.
What is the difference between kinetic and potential energy and how do they work?
To explain, I will use the equations for kinetic and potential energy:
[tex]PE = mgh\\KE = \frac{1}{2}mv^{2}[/tex]
Potential energyPotential energy is the potential an object has to move due to gravity. An object can only have potential energy if 1) gravity is present and 2) it is above the ground at height h. If gravity = 0 or height = 0, there is no potential energy. Example:
An object of 5 kg is sitting on a table 5 meters above the ground on earth (g = 9.8 m/s^2). What is the object's gravitational potential energy? (answer: 5*5*9.8 = 245 J)
(gravitational potential energy is potential energy)
Kinetic energyKinetic energy is the energy of an object has while in motion. An object can only have kinetic energy if the object has a non-zero velocity (it is moving and not stationary). An example:
An object of 5 kg is moving at 5 m/s. What is the object's kinetic energy? (answer: 5*5 = 25 J)
Kinetic and Potential EnergySometimes, an object can have both kinetic and potential energy. If an object is moving (kinetic energy) and is above the ground (potential), it will have both. To find the total (mechanical) energy, you can add the kinetic and potential energies together. An example:
An object of 5 kg is moving on a 5 meter table at 10 m/s. What is the objects mechanical (total) energy? (answer: KE = .5(5)(10^2) = 250 J; PE = (5)(9.8)(5) = 245 J; total: 245 + 250 = 495 J)
Gravity is a force between any two objects with mass. Why doesn't a person feel a gravitational force between him/herself and another person?
A) A person doesn't exert a gravitational force.
B) The two gravitational forces cancel each other out.
C) The gravitational forces of people is so small it is overshadowed by that of Earth.
D) There are so many people we are actually balanced by all the different gravitation
Answer:
C) The gravitational forces of people is so small it is overshadowed by that of Earth.
what is the force acting on the object?(g=10m/s^2)
Answer:w=mxg
2x10 =20 N
Explanation:force acting downwards is mg mass into gravitional feild
-A: Find the force that must be exerted on the rod to maintain a constant current of 0.156 A in the resistor? (In mN)
-B: What is the rate of the energy dissipation in the resistor? (In W)
-C: What is the mechanical power delivered to the rod? (In W)
A) Force: 0.0528 N
B) Power dissipated: 0.307 W
C) Power delivered: 0.307 W
Explanation:
A)
The force experienced by a current-carrying wire in a magnetic field is given by
[tex]F=ILB[/tex]
where
I is the current in the wire
L is the length of the wire
B is the strength of the magnetic field
In this problem, we have:
L = 0.451 m
B = 0.751 T
I = 0.156 A
Therefore, the force is
[tex]F=(0.156)(0.451)(0.751)=0.0528 N[/tex]
B)
The rate of energy dissipation in the resistor is the power dissipated in the resistor, and it is given by
[tex]P=I^2R[/tex]
where
I is the current in the resistor
R is the resistance
For the wire in this problem,
I = 0.156 A
[tex]R=12.6\Omega[/tex]
Therefore, the power dissipated is
[tex]P=(0.156)^2(12.6)=0.307 W[/tex]
C)
The mechanical power delivered to the rod is given by
[tex]P=VI[/tex]
where
V is the potential difference across the rod
I is the current in the rod
The potential difference across the rod must be equal to the potential difference across the resistance, which can be found by using Ohm's law:
[tex]V=RI=(12.6 \Omega)(0.156 A)=1.97 V[/tex]
Therefore, the power delivered to the rod is
[tex]P=(1.97 V)(0.156 A)=0.307 W[/tex]
This power is equal to the power dissipated on the resistor: this is due to the law of conservation of energy, in fact the total energy must remain constant, so here the electric energy is transformed into mechanical energy of motion of the rod.
9. An 800 kg police boat slows down uniformly from 50 km/h [E] to 20 km/h (E) as it enters a
harbour. If the boat slows down over a 30 m distance, what is the force of friction on the boat?
(Hint: You will need to convert the velocities into m/s.)
Answer:
2,158N
Explanation:
According to the second newtons law of motion, Force(F) = mass(m) × acceleration (a)... 1
Given mass to be 800kg.
We need to get the acceleration of the body using one of the equations of motion.
v²= u²+2as ... (2)where;
v = final velocity = 50km/hr
u = initial velocity = 20km/hr
a is the acceleration
s is the distance covered by the boat = 30m
Converting 50km/hr and 20km/hr to m/s, this gives us
50km×1000m/1hr×3600s
= 50000/3600
= 13.9m/s
Similarly,
20km/hr = 20000m/3600s
= 5.6m/s
Substituting this values into the equation 2 to get acceleration, we have
13.9²= 5.6²+2a(30)
193.21 = 31.36+60a
60a = 193.21-31.36
60a = 161.85
a = 2.69m/s²
To get the force on the both we substitute the value of mass and acceleration in equation 1
F =ma
F = 800×2.69
F= 2,158N
Therefore the force of friction on the boat is 2,158N
A construction worker drags a box across the floor. If the frictional force between the floor and the box is 12.2 newtons, how much work does friction do as the box moves 11.5 meters?
The work done is 140.3 J
Explanation:
The work done is defined as the amount of force required or used to move an object over a particular distance. Hence, work done is the product of force in Newton and the distance in which the object moved in meters. Here, in the question, it is given that there is a frictional force acting on the box by the floor and the distance it moves. Hence, to get the answer to multiply frictional force and the distance. So, will get the work done as 140.3 J.Final answer:
The work done by the frictional force as the box moves 11.5 meters is -140.3 joules, indicating the force is opposing the box's motion.
Explanation:
To calculate the work done by friction as a box moves across a floor, we need to use the equation for work, which is work done (W) = force (f) × distance (d) × cos(θ), where θ is the angle between the force and the direction of motion. Since friction always acts opposite to the direction of motion, the angle θ here is 180 degrees, and cos(180°) is -1. Therefore, the work done by the frictional force is negative, indicating that it's in the opposite direction to the displacement of the box.
The frictional force between the box and the floor is given as 12.2 newtons, and the box moves 11.5 meters. Substituting the given values into the work equation gives:
W = f × d × cos(180°) = 12.2 N × 11.5 m × (-1) = -140.3 joules.
The negative sign indicates that the work done by the frictional force is in the opposite direction of the displacement, meaning it resists the motion of the box.
A train traveling at 27.5 m/s accelerates to 42.4 m/s over 75.0 s. What is the displacement of the train in this time period
Answer:
2621.25 meters
Explanation:
First, write down what we are given.
Initial velocity = 27.5 m/s
Final velocity = 42.4 m/s
Time = 75 seconds
We need to look at the kinematic equations and determine which one will be best. In this case, we need an equation with distance. I am going to use [tex]v_{f}^{2} = v_{i}^{2} +2ad[/tex], but you can also use the other equation, [tex]x = v_{o}t+\frac{1}{2}at^{2}[/tex]
We need to find acceleration. To find it, we need to use the formula for acceleration: [tex]a = \frac{v_{f}-v_{i}}{t}[/tex]. Plugging in values, [tex]a = \frac{42.4-27.5}{75} = .199\ m/s^{2}[/tex]
Next, plug in what we know into the kinematics equation and solve for distance. [tex]42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters[/tex]
The amusement park ride shown above takes riders straight up a tall tower and then releases an apparatus holding seats. This apparatus free-falls back to Earth and is stopped safely right above the ground. Which of the following indicates the magnitude of the gravitational force exerted on a rider of mass m on the way up and on the way down?
The answer & explanation for this question is given in the attachment below.
The magnitude of the gravitational force exerted on a rider of mass m during both ascent and descent on an amusement park ride is defined as F = mg, with F being the gravitational force, m the mass of the rider, and g the acceleration due to gravity (~9.81 m/s²).
Explanation:The gravitational force exerted on a rider with a mass m during both ascent and descent in an amusement park ride is characterized by the same magnitude. This force is given by the expression F = mg, where F is the gravitational force, m is the mass of the rider, and g is the acceleration due to gravity, which is approximately 9.81 m/s² on Earth. Let's break this down:
On the way up: The gravitational force is acting downwards, against the motion of the rider. This force works to slow the upward motion of the rider.On the way down: The gravitational force is acting downwards, in the same direction as the motion of the rider. This force is what causes the rider to accelerate downwards, or free-fall, until the apparatus is safely stopped just above the ground.In both scenarios, note that the actual sensation the rider feels (the 'felt' force) might be different due to the combination of gravitational force and the inertia of the rider's body. This inertia entails a resistance to changes in motion and can lead to what we often describe as the 'thrill' of the ride.
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Does sand stay sand forever?
Answer:
No sand doesn't stay sand forever.
Explanation:
We may have a thought that the sand we see on the beach areas are always the same one for eternal, but it is not true.Due to different activities like beach nourishment, sand replenishment etc. the sand in the beach areas are changed and replaced.If the sand remained there for long time, it also affects the sand eating organisms and plants.A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder?
Answer: 130000 J
Explanation: Work is the product of force and distance.
W = F x d
= 5200 N x 25 m
= 130000 J
Boyle's Law states that as the pressure on a gas increases at constant temperature the volume of the gas
A) Increases
B) Decreases
C) Stays the same
D) There is no relationship between pressure and volume
Boyle's Law states that the volume of a gas decreases as pressure increases at constant temperature. This is a fundamental concept in Chemistry.
Explanation:Boyle's Law, a fundamental principle in Chemistry and Physics, states that at a constant temperature, the volume of a gas is inversely proportional to the pressure applied on it. So, if the pressure on a gas increases and the temperature remains constant, the volume of the gas correspondingly decreases (Option B). In other words, if you squeeze a gas (increasing the pressure), it will take up less space (decreasing the volume), provided the temperature does not change.
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