A 12-kg sled is moving at a speed of 2.0 m/s. At which of the following speeds will the sled have twice as much kinetic energy? A. 2.8 m/s B. 4.2 m/s C. 6 m/s D. none of the above

Which description does the phrase "mechanical advantage" most closely relate to?

How much heat is required to change the temperature of 12 grams of iron by 10 degrees Celsius if irons specific heat is 450J/g degrees Celsius

Until the late 1800s, which of the following sources was used to heat most homes? fossil fuels o electricity biomass solar energy

A child playing in a swimming pool realizes that it is easy to push a small, inflated ball under the surface of the water, whereas a large ball requires a lot of force.

What is the acceleration of a rocket if 200 Newtons are applied to its 5.5 kg

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.

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N