Which example involves the transformation of chemical energy directly into light energy?

The weight of 80 kg of mass on mercury is 296 N and almost identical to the weight of the same mass on Mars but mercury has much less mass than Mars explain how this can be. (what else could affect gravitational force?)

Children in a tree house lift a small dog in a basket 4.00 m up to their house. If it takes 187 J of work to do this, what is the combined mass of the dog and basket?

If there is no change in force as you increase the mass a truck is carrying, its acceleration is?

Choose the most acidic substance in the group. lemon juice, pH = 2.25 orange juice, pH = 3.75 milk, pH = 6.6 seawater, pH = 8

Why is the simultaneous detection of methane and oxygen in an atmosphere a good indication of the existence of a biosphere on that planet?

A two stage rocket leaves its launch pad moving vertically with an average acceleration of 4 m/s2. at 10 s after launch the first stage of the rocket (now without fuel) is released.

A liquid filled sealed system has cylinders with movable pistons on each end. The face of one piston has an area of 5 cm². The other piston has an area of 500 cm² and is supporting a weight of 2 kN on it.

A turntable is spinning on a frictionless axle when a ball of putty is dropped onto it from above. The putty sticks to the turntable when it lands. Is angular momentum conserved for the turntable and putty (the system) during this process?

A cheetah can run from 0 to 70 mph in 2.2 seconds. what is the cheetah's top speed in m/s?

Which statement about how light travels is true? A Light waves need a medium to travel, and they travel at the same speed even if the light source is moving.