Why don't we use more renewable energy sources

What physical improvements might result from his training?

An airplane flying horizontally at a constant speed of 350 km/h over level ground releases a bundle of food supplies. Ignore the effect of the air on the bundle.

A ball is thrown upward and reaches a maximum height of 100m and then returns back to where it was launched. The displacement of the ball is A) 0 m B) 100 m C) 200 m D) more than 200 m

In the absence of air resistance, a ball is thrown vertically upward with a certain initial KE. When air resistane is a factor affecting the ball, does it return to its original level with the same, less or more KE?

A sports car accelerates from zero to 30 mph in 1.5 s. How long does it take for it to accelerate from zero to 60 mph, assuming the power of the engine to be independent of velocity and neglecting friction? A. 2 sB. 3 sC. 4.5sD. 6 sE. 9 s

Old-fashioned heating systems sent steam into radiators in each room of a house. in the radiators, the steam condensed back to water. analyze this process and explain how it heated a room.

If a space ship is traveling with a constant acceleration of 75 m/s^2 and travels for three weeks, how far did it travel and what was it's velocity before it stopped?

How could you change your track to maximize the kinetic energy of the skater? Explain?

3. However, until 2002, these three countries used different A. currents B. undercurrent C. currencies D. currency E. crosscurrent F. current G. currently

In the hydrologic cycle, water evaporates into the atmosphere. It then condenses and falls to the ground as precipitation. How can the water return to the atmosphere?