Any external force that acts against movement is called

A. gravity

B. efficiency

C. resistance

D. momentum

A feather is dropped on the moon from a height of 2.0 meters. The acceleration of gravity on the moon is 1.67 m/s2. Determine the time for the feather to fall to the surface of the moon.

a) For a given material, would you expect the surface energy to be greater than, the same as, or less than the grain boundary energy?

A piece of iron with a temperature of 300 degrees Celsius is dropped into a gallon of water with a temperature of 25 degrees Celsius heat will?

Use the scientific method to disprove the theory that "the Earth is the center of the universe."

An airplane is flying at Mach 1.48 at an altitude of 7,800.00 meters, where the speed of sound is v = 311.83 m/s. How far away from a stationary observer will the plane be when the observer hears the sonic boom? (Enter the total distance in m.)

A motorist driving at 25 meters/second decelerates to 15 meters/second. The combined mass of the vehicle and the driver is 1.5 * 10³ kilograms. What is the amount of mechanical work done by the vehicle?

All forces are different each exerts a particular type of effect on an object

Witch statement about polymers is true

Two bullets have masses of 3,0 g and 6.0g, respectively. both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies

What does it mean that a form of energy might take more energy to harness than it provides? Are renewable resources always renewable, or can they become non-renewable? Why aren't renewable resources used for everything that we use energy for?