An apple hanging from a limb has potential energy because of its height. If it falls, what becomes of this energy just before it hits the ground? When it hits the ground?

Q: A man of mass 60 kg runs up a flight of 30 steps in 40 s. If each step is 20 cm high, calculate his…

A: Step 1   ∙Mass of man m=60kg   ∙Flight 30 steps in 40sec.   ∙Each step is 20cm high.

Q: When a jumbo jet slows and descends on approach to landing, there is a decrease in both its kinetic…

A: According to the law of conservation of energy, the energy cannot be created or destroyed, but it…

Q: A 20 kg block is raised vertically 5 meters. Find the change in potential energy.

A:

Q: Does the work you do on a book when you lift it onto a shelf depend on the path taken? On the time…

A: Work done

Q: Does the kinetic energy of a car change more when it goes from 10 to 20 km/h or when it goes from 20…

A: The change in kinetic energy when the car moving from 10 to 20 km/h is ΔKE=12m20 km/h2-10…

Q: What is the difference between kinetic and potential energy?

A: Here given the name of two energy . Kinetic and potential energy. We have to define the difference…

Q: If the skater needs 4176 J of potential energy at the top of the hill, what height must the ramp be?

A: The energy possessed by an object when raised to an height h above the ground is known as the…

Q: When I throw my keys straight up in the air and let them fall, why is there more Kinetic energy and…

A: According to conservation of energy  (Total energy )final  = (total energy ) initial

Q: why is the maximum work a force can do on an object occur when the force is in the same direction of…

A:

Q: Jack and Jill are both helping to fetch a pail of water in a hill that is 16 meters high. Each of…

A: Given: mass of water m = 5 liter = 5kg distance travelled d = 16m time taken by Jack t1=1.5hrs  time…

Q: What is the difference between work and energy?

A: Introduction: Work is the transferring of some amount of energy with the help of force.

Q: Which requires more work - lifting a 50-kg sack a vertical distance of 2m or lifting a 25-kg sack a…

A:

Q: My 3.25 kg cat, Pretty Kitty, likes to sit on the tallest perch in her cat tree, 2 m tall. What is…

A:

Q: how much power would you have produced if you lifted 200 kg upwards 2 meters in 0.5 seconds?

A: Given Mass m = 200 kg Height h = 2 m Time t = 0.5 s

Q: If your friend pushes a lawnmower 4 times as far as you do while exerting only half the force, which…

A: The work is force times distance. Your friend uses a half of the force but goes four times as far.…

Q: 2.5 kg dictionary from the floor onto a shelf 1.9 How much work (in Joules) is done in lifting:a m…

A: The work done in joules can be calculated in given steps:Given:

Q: A ball was launched upwards and vertically at a speed 3 m/s up to a height 4 m. What the work done…

A:

Q: How much net work must be done to accelerate a 1000 kg 20 m / s to 30 m / s?

A: According to the work energy theorem, the work done must be equal to the change in kinetic energy.…

Q: In a "pop fly a 1.5 x 10^2 g baseball is projected vertically upward with an initial kinetic energy…

A:

Q: A painter of mass 80 kg climbs 3.0 m up a ladder. The painter's potential energy has increased by

A:

Q: A car travelling at a speed of 60 km/h has a kinetic energy of 200 kJ. If the speed of the car is…

A: Given data The initial velocity of the car is given as u = 60 km/h. The initial kinetic energy of…

Q: An object is dropped at a height of 12m at what height is kinetic energy and potential energy the…

A: The potential energy of an object at mass m at  height h, is, U = mgh The velocity v of an object at…

Q: Two people who weigh the same climb a flight of stairs. The first person climbs the stairs in 30 s,…

A: The work done is the product of force and displacement. Here, force is the weight of the person and…

Q: is a person climbing a ladder potential or kinetic energy?

A: We know that energy can neither be created nor destroyed. However, energy can always change its form…

Q: How much work is needed for a 73-kg runner to accelerate fromrest to 7.7 m>s?

A:

Q: If 2.0 J of work is done in raising a 0.180 kg apple, how far is it lifted? (Remember: F = mg)

A: Given  Work done W=2J Mass of apple m=0.18kJ

Q: Two identical golf carts move at different speeds. The faster cart has twice the speed and therefore…

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Q: How much work does a sled dog do if she pulls with a force of 55 N on a horizontal track over a…

A: Here, Force and displacement are in the same direction, Therefore, Work done= Force x Distance…

Q: A 50-kg platform diver hits the water below with a kinetic energy of 5000 Joules. The height…

A: Given:  mass, m = 50 kg  kinetic energy, K = 5000 J  g = 10 m/s/s

Q: A man pushes very hard for several seconds on a heavy rock, but the rock does not budge. Has the man…

A: To determine Work done by the man

Q: The work you do when pushing a shopping cart twice as far while applying double the force is A)…

A:

Q: The car which accelerates down the hill is the best example for energy.

A:

Q: A 100-lb boy runs up a staircase to a floor 15 ft higher in 5.45 s. His power output is.     Six…

A:

Q: An athletic champion can produce one horsepower of power (746 W) for a short period of time. The…

A: Scenario - An athletic champion does work against gravity to develop power. Given : Athlete…

Q: What can you do to increase the power you develop as you climb a flight of stairs?

A: Power is defined as the work done per unit time. P=worktime According to the work-kinetic enrergy…

Q: Samantha pushes a 9.6 kg crate up a ramp 7.3 * 104 m in length and inclined at 2.1° with the…

A:

Q: A stone is thrown up in the air and just barely makes into onto the roof of a garage. When is its…

A: Kinetic energy of any object is given by :- KE =  (1/2)mv2 Kinetic energy of stone will be maximum…

Q: now much work does he do on the crate?

A: We know the work done W=F. d------------------(1) ANS: The work done is 919.24 N-m or 920 Joule.

Q: On a playground slide, a child has potential energy that decreases by 1000 J while her kinetic…

A: The dissipative force involved during sliding motion is the frictional force between the ground and…

Q: A 4.0-kg rock is dropped from a height of 9.0 m. At what height is the rock's kinetic energy twice…

A: Given : mass of rock, m  = 4 kg                initial height of rock, H = 9 m

Q: Does the kinetic energy of a car change more when it goes from 10 to 20km/h or when it goes from…

A: Calculating the change in kinetic energy for the given velocity ranges:

Q: *A 3-kg box falls from a height of 4 m. Just before hitting the ground, what will be it's kinetic…

A: Given Data: m = 3 kg g = 10 m/sec2 h = 4m   Formula Used: Kinetic energy at bottom = potential…

Q: A weightlifter raises a 150-kg barbell from the floor to a height of 2.2 m in 0.80 s. What is his…

A:

Q: A Boeing 747 weighing 520,000 pounds needs to be raised 7.34 feet in the air so maintenance can be…

A:

Q: A van has a mass of 3500 kg and a car has a mass of 1750 kg. If both are traveling at the same…

A: Kinetic energy K=12mv2 Kinetic energy is directly proportional to the mass of the object

Q: Why does one get tired when pushing against a stationary wall when no work is done on the wall?

A: Work done can be calculated as the product of the displacement and the force applied.