A stationary observer views the approach of a spaceship moving at a relativistic speed. The observer knows the ________ of the spaceship, as it moves past, is less than if it were stationary with respect to her.
A. height
B. length
C. density
D. mass
Answer: B
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A flatbed truck is carrying a crate along a level road. The coefficient of static friction between the load and the bed is 0.40. The truck accelerates forward and the crate stays in its place on the truck bed
In what direction is the force that the bed exerts on the crate? A) forward B) backward C) toward the center of the road D) There is no frictional force because the crate does not move with respect to the bed. E) There is not enough information to answer this question.
In the figure, if a = 2.0 cm, b = 4.0 cm, and I = 2.0 A, what is the magnitude of the magnetic field at point P?
a.
49 ?T
b.
39 ?T
c.
50 ?T
d.
69 ?T
e.
13 ?T
What was detected on Halley's Comet and observed on Hale-Bopp that imply the possibility of life on Earth originating in space?
A) DNA B) amino acids C) organic material D) nucleotide bases E) ammonia
It is necessary to determine the specific heat of an unknown object. The mass of the object is measured to be 199.0 g. It is determined experimentally that it takes 16.0 J to raise the temperature 10.0°C. Find the specific heat of the object
A) 8.04 J/kg ? K B) 1600 J/kg ? K C) 0.00120 J/kg ? K D) 3.18 × 106 J/kg ? K