Describe the relative amounts of potential and kinetic energy for a book in the following situations. a. The book on a high shelf which is 2 meters off the ground.
All energy is in form of potential energy.

b. The book after it has fallen off the 2-meter shelf and is now 1 meter off the ground.
Half of the energy is potential, half is kinetic.

c. The book just before it hits the ground.
All the energy is kinetic.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)