EP EK Energy Transfers

A bow can shoot a 0.042 kg arrow at a speed of 16.5m/s. What is the kinetic energy of the arrow in Joules

(a)  

A high jumper has a mass of 62 kg. She jumps to a maximum height of 2.3 m.  

  Calculate the gravitational potential energy, in Joules of the jumper at her maximum height.

 

(a)  

A cheetah can run with a speed of 34 m/s and has a kinetic energy of 33000 J.

  What is the mass of the cheetah in kilograms?

(a)  

In an elevator, it takes 66 kJ of energy to lift a group of eight people up 12 m.

What is the average mass of a person in the group in kilograms?

(a)  

A climber has a potential energy of 11000 J. If the mass of the climber is 85 kg determine their height above the ground.

(a)  

On a particular planet, it takes 850 J for a 50 kg remote probe to launch itself up 2 m.

What is the gravitational field strength in N/kg on the planet?

(a)  

It takes 338000 J of energy to move a car of mass 1000 kg at a speed of v. Calculate v in m/s.

(a)  

A 2kg ball and a 5kg are thrown off the side of a 5m high building.

Which ball will hit the ground with more energy?

• 2kg Ball

• 5kg Ball

• Both will hit the ground with the same energy

A 2kg ball and a 5kg are thrown off the side of a 5m high building.

Which ball will hit the ground at higher speed?

• 2kg Ball

• 5kg Ball

• Both will hit the ground at the same speed

A 3.0 kg ball is dropped from a window 4.0 m from the ground.

By considering energy changes, determine the speed, in m/s, at which it will hit the ground.

(a)