After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12J and 24J. What can be said about the kinetic energy of the two balls before the collision?
a. nothing—not enough information is given
b. the balls had the same energies, 12J and 24J respectively
c. the total kinetic energy of the two balls was 36J
d. none of the above
C
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The second postulate of special relativity states that the speed of light, when measured in a vacuum, is constant for all observers
a. True b. False Indicate whether the statement is true or false
During the month of June the north celestial pole points towards Polaris, but during the month of December it points
a. just north of Polaris. b. just south of Polaris. c. towards the star Vega. d. towards the star Thuban. e. still towards Polaris.
In the figure, a block of mass m is moving along the horizontal frictionless surface with a speed of 5.70 m/s
If the slope is 11.0° and the coefficient of kinetic friction between the block and the incline is 0.260, how far does the block travel up the incline? What will be an ideal response?
Parallel rays of light that hit a concave mirror will come together:
a. at the focal point. b. at a point half way to the focal point. c. at infinity. d. at the center of curvature.