Which of the following objects is experiencing Earth's gravitational force?
A. a skydiver falling under the force of gravity
B. an airplane taking-off
C. a boat floating in water
D. All of these choices are correct.
E. Only an airplane taking-off and a skydiver falling under the force of gravity above.
Answer: D
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(4x)cos(3t), where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75 b. 0.25 c. 1.3 d. 12 e. 3.0
A star more massive than our Sun
A) will have a longer lifetime B) will have a shorter lifetime C) will have the same lifetime as the Sun D) could have either a longer lifetime or a shorter lifetime depending on its chemical composition
If R1 = 3.0 ?, R2 = 6.0 ?, R3 = 12 ?, and I = 0.50 A, at what rate is heat being generated in R1?
a.
20 W
b.
17 W
c.
12 W
d.
31 W
e.
6.0 W
Snell's Law: A light ray in air strikes a glass plate whose index of refraction is 1.42. Some of the light reflects off the surface of the plate, but most of it enters the glass. If the angle of refraction is one-half the angle of reflection, the angle of refraction is closest to which one of the following angles?
A. 45° B. 43° C. 41° D. 39° E. 37°