Which statement is true regarding flexibility?
a. joint's range of motion cannot be maintained with age.
b. a joint's range of motion will be lost if the joint is not used regularly.
c. flexibility decreases with age because muscle strength increases.
d. flexibility decreases at a rate predetermined at birth.

What are similarities and differences between refraction, reflection, diffraction and absorption?

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?