The period of a mechanical wave is 5 seconds. what is the frequency of the wave?
a: 10 hz
b: 2.5 hz
c: 0.2 hz
d: depends on the speed of the wave

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

An element becomes a positively charged ion when itloses protons. loses electrons. gains electrons. gains neutrons.

Aspaceship starting from a resting position accelerates at a constant rate of 9.8 meters per second per second. how far will the spaceship travel if its final speed is 1 percent the speed of light (300,000,000 m/s)? a. 3.1 × 106 m b. 2.94 × 108 m c. 7.8 × 1010 m d. 4.6 × 1013 m