Y apalve acess. C Yehoo Ses Secure x Quiz l https/Ajc Ch Reading 8 Quiz x in whi

Question

Y apalve acess. C Yehoo Ses Secure x Quiz l https/Ajc Ch Reading 8 Quiz x in which one of the Alarge following Agirl rests situations there boulder is at O Ahelicopter down the a in o Achild takes a bottom a decrease gravitational from of off bed steep Atruck accidentally from and hill. potential the Lands her drives releases roof on feet. energy? at average a of hospital flies an helium-filled and velocity balloon due of m/s,due it west. 25 and flies north upward along into a the clouds. road. D Question 4 Which one o of following the The total statem Kinetic energy the concerning Thermal energy in universe the energy may has principle be a be into constant of may conservation converted converted gravita value. of into potential energy false? kinetic is and energy energy kinetic and heat. Chemical not energy be The may work converted done on into an object thermal must er be ze and joules gravitational since energy potential neither energy. created nor destroved in 20 pts

Explanation / Answer

formula for gravitationl potential energy

PE = mgh

in first case boulder at rest at the bottom of the hill so PE is constant

in second case height decreases so gravitational potential energy decreases

in third case gravitational potential energy increases

in fourth case helium filled ballon position increases ( height increases) so GPE increases

in fifth case trcuk has kinetic energy

so option second case is the correct answer

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from the work energy theorem, the net workdone is equal to change in kinetic energy of the object

so it is not zero

last option is false

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