Answer:
B. 150 minutes per week
Explanation:
American Heart Association suggests at least 150 minutes per week of moderate-intensity aerobic activity to adults.
It takes 200 N to move a box 10 meters in 8 seconds. How much power is
required?
O
O
A. 250 W
B. 25 W
O
O
c. 2,000 J
D. 16,000 W
Q
Answer:
A
Explanation:
The equation of power is defined as Power = Workdone/Time Taken
And workdone = Force x Distance so using these equations we get they workdone is, 200x 10 = 2000Nm.
Dividing workdone with time will yield power, 2000 ÷ 8 = 250 Nm/s = 250W.
a car moved 60km east and 90km west in 25 seconds. what is the velocity
Answer:6000m/s
Explanation:
A 10,844.0 kg truck is initially at rest. The truck then accelerates across a level road and reaches a constant speed. It takes the truck 25.4 seconds to reach its final speed. At this speed, the truck has 41,505.4 joules of kinetic energy. How much power did the truck require to accelerate the truck in this time? Round your answer to the tenths place.
Answer:
1,634.1 W
Explanation:
Power = work / time
P = 41,505.4 J / 25.4 s
P = 1,634.1 W
A 1,155 kg truck has a velocity of 18 m/s. What is the momentum of the truck?
Round your answer to the whole number.
The momentum of truck is 20790 kg m/s
Solution:
Given that we have to find the momentum of truck
From given, 1155 kg truck has a velocity of 18 m/s
Therefore,
Mass = 1155 kg
Velocity = 18 m/s
The momentum is given by formula:
[tex]p = m \times v[/tex]
Where, m is mass in kg and v is velocity in m/s
Substituting the values we get,
[tex]p = 1155 \times 18\\\\p = 20790[/tex]
Thus momentum of truck is 20790 kg m/s
when a flat mirror forms an image, how does the angle of light rays that reaches your eyes compare to the angle of the rays striking the mirror
Answer: the angles are equal
Explanation:
A shallow slope on a phase-change graph indicates _____.
A. a little temperature increase for a lot of heat
B. a phase change
C. a large change in kinetic energy of the molecules
D. a high latent heat
A shallow slope on a phase-change graph indicates - A. a little temperature increase for a lot of heat.
To understand this, let's break down the concepts involved:
Latent Heat: When a substance undergoes a phase change (like melting or boiling), it absorbs or releases heat without changing temperature. This heat is known as latent heat.
Phase Changes: During a phase change, such as ice melting into water, the temperature of the ice remains at 0°C until it has completely melted. Only after the phase change is complete does the temperature of the water begin to increase.
Shallow Slope on Graph: In a graphical representation, the shallow slope during a phase change signifies that while a large amount of heat is added, the temperature remains constant until the phase change is completed. This reinforces the idea that energy is being used to break molecular bonds rather than increasing kinetic energy.
Help plz
Does everyone in the earth experience solar eclipse?
Answer:
while all of the world can experience a solar eclipse it is not normally at the same time so one part of the earth might have it but not the other and even in one area if there is one in north america like the last one in texas we did not have a full eclipse
Answer: To answer your question.Not at all because the shadow that the moon cast on the earth is not very broad,as the earth rotates ,the path of the total eclipse is a narrow one.
Total solar eclipses are rare events actually. Although they occur somewhere on Earth every 18 months on average, this is estimated to recur at any given place only once every 360 to 410 years, on average as the case may be .
The purpose of conducting wires in a circuit is to _____.
Answer:to transfer electric current from one point to another
Explanation:
To transfer electric current from one point to another
Answer:
To conduct electricity.
Explanation:
The purpose of conducting wires in a circuit is to conduct electricity. The wire conducts electricity by allowing current flow through it from one point to another in the circuit .
How does the specific heat capacity of water compare with that of other common substances?
Answer:
Water has an abnormally high heat capacity compared to most other substances.
The specific heat of water is high relative to the specific heat of other substances. Water takes a lot of energy to heat and takes a long time to lose the heat. We make use of this by using a hot water bottle to keep warm. The onshore breeze from an ocean or large lake is due to the water taking longer to lose heat than the land. The warmer body of water at the end of the day takes time to cool at night so drags air from the land; the cool body of water in the morning is responsible for air blowing onto the land in the morning.
Bricks are also good heat sinks.
Explanation:
6) 100 ml of water is initially at 20°C. 30,000 J of heat is added to the water. What is temperature change for the water?
The temperature change of water is equal to 71.67 °C
Explanation:
Given:
Amount of transferred energy = 30,000 K J
Mass of water = 100 ml
Initial temperature = 20°C
To find the change in temperature of water.
Formula for Heat capacity is given by
Q = m×c×Δt ........................................(1)
where:
Q = Heat capacity of the substance (in J)
m=mass of the substance being heated in grams(g)
c = the specific heat of the substance in J/(g.°C)
Δt = Change in temperature (in °C)
Δt = (Final temperature - Initial temperature) = T(f) - T(i)
Q = 30,000 J
Mass of water = m = 100 ml
1 ml = 1 g ................................................(2)
Therefore m = 100 ml = 100 g
Specific heat of water is c = 4.186 J /g.
Δt = ?
Substituting these in equation (1), we get
Q = m×c×Δt
Rearranging the terms for Δt,
Δt = [tex]\frac{Q}{m\times c}[/tex]
Δt = [tex]\frac{30,000}{100\times 4.186} = \frac{30,000}{418.6}= 71.67\°C[/tex]
Δt = 71.67 °C
A force 8.0 newtonsis is applied to an object with a mass of 250g.what will be the acceleration of the object due to the force?
Answer:
32m/s^2
Explanation:
force=8.0N
Mass=250g
Converting from gram to kilogram :
250g=(250g) * (1kg)/(1000g)
The grams cancel out, to give
=0.25kg
acceleration =?
Force= mass of object * it's accelaration
Where,
Force = F
mass = m
acceleration =a
8.0N = 0.25kg * a
Therefore, a = 8.0N/0.25kg
a= 32m/s^2.
Force is responsible for causing an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate.
Therefore, the acceleration of the object is 32m/s^2.
Final answer:
The acceleration of the object due to a force of 8.0 N is 32 m/s².
Explanation:
To find the acceleration of an object due to a force, you can use the formula F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration. In this case, the force applied is 8.0 N and the mass is 250 g. However, it is important to convert the mass to kilograms before using the formula. So, the mass becomes 0.250 kg. Plugging these values into the formula, we get:
F = ma
8.0 N = 0.250 kg × a
To solve for a, divide both sides of the equation by 0.250 kg:
a = 8.0 N ÷ 0.250 kg
a = 32 m/s²
Therefore, the acceleration of the object due to the force of 8.0 N is 32 m/s².
For an object of mass m and acceleration a, which equation can be used to
calculate the applied force on the object?
Answer:
F = ma
Explanation:
If mass = m
Acceleration = a
Force = F
Force can be calculated by the product of mass and acceleration.
That is F = ma
This equation is gotten from newton's second law of motion which states that the rate of change of momentum of a body is proportional to the applied force which takes place in the direction of force applied
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Answer:
Force = mass x acceleration i.e F = ma
Explanation:
The force equation is in accordance with Newton's second law of motion, the law states that the acceleration of an object depends on two variables which are
i) The force acting upon the object.
ii) The mass of the object.
The acceleration of an object is directly proportional to the force acting on the object, and inversely proportional to the mass of the object.
This means that if the force acting on the object increases, the acceleration of the object will also increase and if the mass of the object increases, the acceleration of the object will decrease.
a ∝ F ------ eqn 1
a ∝ [tex]\frac{1}{m}[/tex] ------ eqn 2
where a = acceleration
F = Force
m = mass
Applied force is the interaction of an object which can be described as an active agent with another object which causes the second object to either accelerate, experience a change in velocity, a change in direction or bring to a halt.
Mass is the amount of matter or substance that makes up an object.
Acceleration is a measure of the change in velocity of an object with respect to time.
combining eqn 1 and eqn 2
[tex]a = \frac{F}{m}[/tex]
i.e
F = ma ------ eqn 3
eqn 3 is the force equation
A force equation depicts the relationship between force, mass, and acceleration. An object of mass m will accelerate given that force F is applied to it.
Why are airbags, helmets, and other safety devices important? Physics
Answer:to prevent serious damage when an accident occur
Explanation:to prevent serious damage when accident occur
Airbags and other safety devices are important as they use the physics concept of impulse to reduce the force on an individual by increasing the impact duration during collisions, thereby reducing the likelihood of injuries or fatalities.
Airbags, helmets, and other safety devices are crucial because they employ the concept of impulse from physics, which helps in reducing the force felt by individuals during collisions. Impulse is defined as the net force multiplied by the time duration over which it acts ([tex]F_{net}[/tex] Δt). When a vehicle is involved in an accident, safety devices such as airbags extend the time over which a person's momentum is brought to a stop. Consequently, the force exerted on their body is significantly reduced, minimizing the risk of severe injuries or fatalities. The concept is that by increasing the time Δt, while the momentum change Δp remains constant, the net force [tex]F_{net}[/tex] is decreased, which illustrates an inverse relationship between force and time during impact. This principle not only applies to airbags, which allow for a more gradual deceleration and less forceful impact but to other vehicle safety aspects, such as crumple zones that extend the collision time, hence reducing the force and potential injury.
Elements in a period have _____________.
Press enter to interact with the item, and press tab button or down arrow until reaching the Submit button once the item is selected
A
The same atomic radius
B
Similar chemical properties
C
The same number of protons
D
A wide range of chemical properties
Answer:
Elements in a period have wide range of chemical properties.
Explanation:
Period is the row of chemical elements's arrangement in the periodic table. It is numbered from 1 to 7. In period as we move towards right the atomic number of element constantly increases along with the change in chemical properties.As we move from left towards right in period, the valence electron number regularly increases in every element.This valence electron differs the reactivity of the elements.
Which statement best describes the weather shown by the blue triangles on a line on a weather map?
A cold front can cause heavy rain, thunder, and lightning.
A warm front brings drizzly weather.
A stationary front may produce rainy or snowy weather for several days.
An occluded front can cause light to heavy precipitation that may last several days.
The best description for the weather shown by the blue triangles on a line on a weather map is by the statement that a cold front can cause heavy rain, thunder, and lightning.
Answer: Option A
Explanation:
The weather map consist of four symbolic color mathematical features. The blue colored triangle represents the cold front. Red colored semi circle, on the other hand, represents the warm front. Then there are some complex symbols, such as the purple colored line with semi circle and triangle drawn in the same side, this represents the occluded front.
Then similarly, purple colored line drawn with semi circle on side and triangle drawn on the other side, represents the Stationary front. Therefore, here the blue colored triangles on a line represents the cold front can cause heavy rain, thunder, and lightning.
A rope vibrates every 0.5 s. What is the frequency of the waves? 5 Hz 2 Hz 0.5 Hz 1 Hz
The frequency of the waves generated by a rope that vibrates every 0.5 seconds is 2 Hz, as frequency is the inverse of the period. Hence, the correct answer is B.
The frequency of a wave is defined as the number of cycles per second, and it is the inverse of the period (the time for one complete cycle). So, if a rope vibrates every 0.5 seconds, that means the period (T) is 0.5 seconds. To find the frequency (f), we use the formula f = 1/T. Therefore, the frequency of the waves is f = 1/0.5 s = 2 Hz.
The organism shown above belongs to A. the plant kingdom. B. both the animal kingdom and the protist kingdom. C. the animal kingdom. D. the protist kingdom.The organism shown above belongs to A. the plant kingdom. B. both the animal kingdom and the protist kingdom. C. the animal kingdom. D. the protist kingdom.The organism shown above belongs to A. the plant kingdom. B. both the animal kingdom and the protist kingdom. C. the animal kingdom. D. the protist kingdom.
The organism shown above belongs to "the animal kingdom".
Answer: Option C
Explanation:
The biological classification's hierarchy involves eight important taxonomic ranks. They are written below in decreasing order: Life > Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species.
The U.S and Canada have historically used a six-kingdom scheme in their traditional textbook, such as Plantae, Animalia, Protista, Fungi, Archaea / Archaebacteria, and Bacteria / Eubacteria. The given image depicts snake which come under "Animalia Kingdom", carnivorous reptiles to suborder Serpentes.
Answer:
c i did it
Explanation:
Wave 1 displaces according the function f(θ)= 2sin θ+1. Wave 2 displaces according to the function f(θ)= 3sin θ+.5. At what angle, in degrees, will the two waves have the same displacement?
Answer:
θ = 30⁰
Explanation:
We have been given two wave displacement equations,
[tex]y_{1} =2sin\theta +1[/tex] ........(1)
[tex]y_{2}=3sin\theta +0.5[/tex] ........(2)
The waves will have same displacements when [tex]y_{1}=y_{2}=y[/tex] (say)
Therefore, operating (2) - (1), we get,
[tex]sin\theta - 0.5=0[/tex]
or, [tex]\theta = sin^{-1}(0.5)=30^{o}[/tex] (since, sin 30⁰ = 0.5)
We can check the answer by putting [tex]\theta=30^{o}[/tex] in equations (1) and (2),
[tex]y_{1}=2sin30^{o}+1=2\times0.5 + 1= 2[/tex]
[tex]y_{2}=3sin30^{o}+0.5=3\times0.5+0.5=1.5+0.5=2[/tex]
Answer:
θ= 30°
Explanation:
Set the wave functions equal to another, as displacements would be the same. Therefore, 2sin θ+1 = 3sin θ+.5.
sin θ=.5
θ= 30°
during one hour trip a small boat travels 8.0 km north and then travels 60.0 km east what is the boat's displacement for the one hour trip
Answer:
60.53km
Explanation:
Check attachment
For how long a time must a tow truck pull with a force of 550N on a stalled 1200kg car to give it a forward velocity of 2.0m/s?
Answer:
4.36 seconds
Explanation:
According to the question;
Force is 550 NMass of the car is 1200 kg Velocity of the car is 2.0 m/sWe are needed to find the time the car must the tow track pull the car.
From Newton's second law of motion;Impulsive force, F = Mv÷t , where m is the mass, v is the velocity and t is the time.Rearranging the formula;
t = mv ÷ F
Thus;
Time = (1200 kg × 2.0 m/s²) ÷ 550 N
= 4.36 seconds
Thus, the time needed to pull the car is 4.36 seconds
A 100 sprinter starts from rest and final velocity of 18.8m/s what is the sprinter average acceleration if takes him 10.6 s to run the 100m race
Answer: 1.77 m/s²
Explanation: acceleration is expressed in:
a= ∆v / t = vf-vi/t
a= 18.8 m/s - 0 / 10.6 s
a= 1.77 m/s²
Final answer:
The average acceleration of the sprinter is 1.774 m/s².
Explanation:
To calculate the average acceleration of the sprinter, we can use the equation:
average acceleration = (final velocity - initial velocity) / time
In this case, the sprinter starts from rest, so the initial velocity is 0 m/s. The final velocity is 18.8 m/s. The time taken to run the 100m race is 10.6 s.
Plugging in these values into the equation:
average acceleration = (18.8 m/s - 0 m/s) / 10.6 s = 1.774 m/s²
What is the kinetic energy of a 3 kg object moving at 4 m/s?
Answer:
kinetic energy of the object is 24 J
Explanation:
As we know that kinetic energy is given as
[tex]K = \frac{1}{2}mv^2[/tex]
here we know that
m = 3 kg
v = 4 m/s
so we will have
[tex]k = \frac{1}{2}(3)(4^2)[/tex]
[tex]k = 24 J[/tex]
so kinetic energy of the object is 24 J
The kinetic energy of the object is 24 J.
Given data:
The mass of object is, m = 3 kg.
The speed of the object is, v = 4 m/s.
The kinetic energy of an object is the energy possessed by any object due to its motion, which is mathematically expressed as half multiplied by mass and square of the speed of object.
That is,
[tex]KE = \dfrac{1}{2}mv^{2}[/tex]
Here, KE is the kinetic energy of object.
Solving as,
[tex]KE = \dfrac{1}{2} \times m \times v^{2}\\\\KE = \dfrac{1}{2} \times 3 \times 4^{2}\\\\KE = 24 \;\rm J[/tex]
Thus, we can conclude that the kinetic energy of the object is 24 J.
Learn more about the kinetic energy here:
https://brainly.com/question/17858145
what are 3 types of potential energy?
Answer:
Three types of potential energy include: Elastic potential energy, which is the energy stored in something when you push, pull, or force it out of shape: think of rubber bands or springs. Chemical potential energy, which is the energy something stores because of its chemical makeup: batteries have this kind of energy.
Explanation:
Potential energy, kinetic energy, and gravitational potential energy are three types of potential energy.
Explanation:Energy is the capacity to do work or create change. It exists in various forms, including kinetic (movement), potential (stored), thermal (heat), electrical, and chemical energy. Energy is a fundamental concept in physics and is vital for all processes in the universe, from powering machines to sustaining life and ecosystems.
Potential energy, kinetic energy, and gravitational potential energy are three types of potential energy. Potential energy is the energy an object has due to its position or condition, while kinetic energy is the energy an object possesses due to its motion. Gravitational potential energy is a specific type of potential energy that an object has due to its position relative to the Earth's surface.
Learn more about Types of potential energy here:https://brainly.com/question/14660613
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Two trains are traveling side-by-side along parallel, straight tracks at the same speed. In a time t, train A doubles its speed. In the same time train B increases its speed by a factor of 5.42. By what factor is the distance traveled by train B in time t greater than the distance traveled by train A in the same time t?
Answer:
yes
Explanation:
Final answer:
The distance traveled by train B in time t is 5.42 times greater than the distance traveled by train A in the same time t.
Explanation:
The distance traveled by train B in time t is greater than the distance traveled by train A in the same time t by a factor of 5.42.
To understand this, let's assume the initial speed of both trains is v. After time t, train A doubles its speed, so its new speed is 2v. On the other hand, train B increases its speed by a factor of 5.42, so its new speed is 5.42v.
Since the distance traveled by a train is directly proportional to its speed, the distance traveled by train B will be 5.42 times greater than the distance traveled by train A in time t.
You walk 53 m to the north, then you turn 60° to your right and walk another 45 m. Determine the direction of your displacement vector. Express your answer as an angle relative to east.
Final answer:
To determine the direction of the displacement vector after walking north and turning 60° to the right, we must use vector addition. The displacement direction relative to east is 150° considering the 90° difference between north and east and the 60° turn to the right.
Explanation:
To determine the direction of your displacement vector while walking 53 m to the north and then turning 60° to your right before walking another 45 m, we need to understand that displacement is a vector quantity. It has both magnitude and direction. Initially, walking 53 m north represents a vector pointing straight up on a diagram where north is up, and east is to the right. When you turn 60° to your right, you are effectively turning towards the east, and walking 45 m along this new direction creates the second part of the displacement vector.
Relative to the east, the final displacement direction can be obtained using vector addition. Since you initially walked north and then turned at a 60° angle to your right, which is equivalent to a 30° angle clockwise from north, the resultant displacement vector will be at an angle from the east that is the complement of 30° (which is 60°), plus the 90° angle between north and east. Therefore, the direction of your displacement vector relative to east would be 150°.
4 Points
A car of mass 1300 kg drives in a circle of radius 85 m. If the car has a speed
of 20 m/s, what is the centripetal force acting on the car?
O
A. 6118 N
O
B. 1300 N
O C. 7982 N
O D. 305.9 N
SUBMIT
Answer:
6118N
Explanation:
HELP FAST
What is the potential energy of the 2 kg ball that is sitting on top of the 40 meter
building?
0803
784
O80 N
784 N
Answer: 784 J
Explanation:
Potential energy is expressed in:
PE= mgh
= 2 kg x 9.8 m/s² x 40 m
= 784 J
ways to stop pollution
Answer:
on days when high particle levels are expected, take these extra steps to reduce pollution:
Explanation:
1) reduce the number of trips you take in your car.
2) reduce or eliminate fireplace and wood stove use.
3) avoid burning leaves, trash, and other materials.
4) avoid using gas-powered lawn and garden equipment.
Which example is a physical change?
a change that produces a new element
a change that breaks a bond between atoms
a change that produces a new compound
a change from one state of matter to another
Answer: a change from one state of matter to another
Explanation: Phase change is an example of a physical change. The chemical composition does not alter during phase change. For example when ice melts its composition is still H2O but in liquid form.
Complete.
For a positive point charge, the lines radiate ………. . While, for a negative point charge, the lines converge …………. .
Answer:
For a positive point charge, the lines radiate outward. While, for a negative point charge, the lines converge inward.
Explanation:
The electric field produced by a single point charge has a radial shape and follows an inverse square law. The magnitude is given by
[tex]E=k\frac{q}{r^2}[/tex]
where
k is the Coulomb's constant
q is the magnitude of the charge
r is the distance from the charge
The direction of the field depends on the sign of the charge. In particular, we have:
For a positive charge, the direction of the field is out of the chargeFOr a negative charge, the direction of the field is towards the chargeThis is due to the fact that the direction of the field shows the direction of the force that a positive test charge would experience in this field. Therefore, since a positive test charge would feel a repulsive force in the field produced by a positive charge, then the direction of the field is outward; on the other hand, a positive test charge would feel an attractive force in the field produced by a positive charge, therefore the direction of the field is inward.