Based on the wall of conservation of energy how can we reasonably improve a machines ability to do work?

Where is the largest National Park?

How does the height of the Sun change throughout the year?

A volleyball is hit and experiences a net force of 2 N, which causes it to accelerate at 8 m/s 2. What is the mass of the volleyball?

Weight is measured in: grams, kilograms, metric tons, or pounds

When cs-137 decays, it emits gamma radiation. the energy of one photon is 1.06 * 10-13 j. what is the wavelength of this radiation?

A 20kg box is dropped 13m. how much work is done

Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimum necessary. Find the magnitude of the frictional force between the person and the wall

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.

Which of the following situations would produce an average velocity of zero? A) a round-trip to school and back B) a horse galloping in a field C) the criss-crossing path of a flying bug D) a trip, first to the moon, then onto Mars