Kinetic versus potential skydiver (2)  |  ProblemA skydiver jumps out of a perfectly good airplane.As she gets closer to the Earth's surface, which of the following best describes the actual transfer of energy?  (So in this case, do not ignore air resistance.) Group of answer choicesPotential energy ---> kinetic energy onlyKinetic energy ---> thermal energy onlyPotential energy   --->   thermal energy onlyKinetic energy ---> potential energy + thermal energyPotential energy ---> kinetic energy + thermal energy

Kinetic versus potential skydiver  |  ProblemA skydiver jumps out of a perfectly good airplane. As she gets closer to Earth’s surface, would you expect her potential and kinetic energy to increase or decrease?  Ignore air resistance in this case. Group of answer choicesPotential energy increases, kinetic energy increases up to a constant value.Potential energy increases, kinetic energy decreases.Potential energy decreases, kinetic energy decreases.Potential energy decreases, kinetic energy increasesPotential energy decreases, kinetic energy increases up to a constant value.

An object is dropped from rest from a certain height. Air resistance is negligible. After falling a distance d, the object’s kinetic energy is proportional to which of the following?

A person jumps from an airplane with a parachute. Which form of energy is decreasing as the person falls to the ground?A Chemical B Kinetic C Nuclear D Potential

An object is released from rest in a vacuum at a height H above the Earth’s surface.As the object falls it passes a point at a height of 0.75H above the surface.What is kinetic energy of the object at a height of 0.75gravitatiHoonal potential energy of the object at a height of H

A ball is projected vertically upwards. Which of the following best describes the energy transfer which occurs as it travels upwards?Energy from its thermal store is transferred to its gravitational potential storeEnergy from its gravitational potential store is transferred to its kinetic storeEnergy from its kinetic store is transferred to its gravitational potential storeEnergy from its elastic potential store is transferred to its gravitational potential store2A skateboarder initially has 5 kJ of kinetic energy. As she freewheels along a flat section of path, she does 400 J of work against friction and air resistance.  Calculate her final kinetic energy.405 J5200 J4.6 kJ395 J3Calculate the kinetic energy of a truck of mass 10,000 kg which is travelling at 20 m/s.2 MJ200,000 J100 kJ4,000,000 J4A 300 kg boulder is resting at the top of a 50 m-high hill. Calculate its gravitational potential energy.  Take g = 10 N/kg.15,000 J360 J150,000 J1,500 J5A tennis ball of mass 100 grams is dropped from a height of 2 metres.  Calculate its speed just before it hits the ground.  In answering this question, you may assume that all of the gravitational potential energy which is initially stored by the ball is transferred to its kinetic store as it falls through the air.  Take g = 10 N/kg.3.16 m/s2 m/s6.32 m/s20 m/s