As an object is lowered into a deep hole in the ground, which of the following assumptions must be made in regard to the object's potential energy?
a. The potential energy increases.
b. The potential energy decreases.
c. The potential energy remains constant.
d. The potential energy increases and then decreases.
Ans: b. The potential energy decreases.
You might also like to view...
The Hubble time is:
A) the time remaining before the Universe stops expanding and begins to contract. B) the time it takes a galaxy moving at 1000 km/sec to move 1 Mpc. C) an estimate of the age of the Universe based on the Hubble constant. D) an estimate of the time it will take the Universe to double in size based on the Hubble constant.
Find Brewster's angle for light in air that is reflected from the top of a water surface. The index of refraction of the water is 1.33
A) 53.1° B) 36.9° C) 56.3° D) 60.2° E) 90.0°
Two long parallel wires 45.6 cm apart are carrying currents of 13.0 A and 23.0 A in the same direction. What is the magnitude of the magnetic field halfway between the wires?
a. 8.77E–6 T b. 3.16E–5 T c. 1.14E–5 T d. 2.02E–5 T e. 4.39E–6 T
Four of following are factors that must be overcome by a large molecular cloud before gravitational contraction can begin. Which one is the exception??
A. thermal energy of gas B. magnetic fields C. rotation of gas clouds D. intense radiation from a nearby star