Can mechanical energy be negative?

Can kinetic energy be negative?

Fill in the blanks An ac generator converts mechanical energy into ___energy.

Verify the law of conservation mechanical-energy for a freely falling body.

A linear oscillator of force constant 2 × 10^6 N/m and amplitude 0.01 m has a total mechanical energy of 160 J. Its

Conversion of heat into electrical energy can be achieved by Accroding to newton's law of cooling (provided the difference of temperature is small ), the rate of loss of heat is proportional to

Write three condition for which the change of Gibbs free energy becomes negative.

A person trying to lose weight (dieter) lifts a 10 kg mass, one , thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated, (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 xx 10^7 J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?

Can the speed of a body negative ?

How can geothermal energy be used to generate electricity?

Can an object have kinetic energy even if its momentum is zero? Explain.