An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The width of this object, as measured by a stationary observer,
A)
approaches infinity.
B)
approaches zero.
C)
increases slightly.
D)
decreases slightly.
E)
does not change.
E
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The diffusion constant for water in air is
What is the distance a water molecule can travel by diffusion in 10min?
A. 17 cm B. 20 cm C. 25 cm D. 31 cm E. 36 cm
Light enters water (n = 1.33) from air. The incident light ray makes a 0.44° angle with the normal to the surface on the air side. What will be the angle made with the normal by the refracted ray on the water side?
A. Nearly 90° B. 1.58° C. 0.188° D. 0.33°
A length of organ pipe is closed at one end. If the speed of sound is 344 m/s, what length of pipe (in cm) is needed to obtain a fundamental frequency of 50 Hz?
a. 28 b. 86 c. 344 d. 172 e. 688
A spaceship approaches the earth with a speed 0.50 c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to the earth?
A) 69 beats per minute B) 73 beats per minute C) 65 beats per minute D) 61 beats per minute E) 80 beats per minute