A mountain climber encounters a crevasse in an ice field. The opposite side of the crevasse is a height h lower, and is separated horizontally by a distance w
To cross the crevasse, the climber gets a running start and jumps in the horizontal direction. If the height of the crevasse increases but the width remains the same, then, A) the minimum speed needed to cross the crevasse increases.
B) the minimum speed needed to cross the crevasse decreases.
C) the minimum speed needed to cross the crevasse stays the same
D) the minimum speed needed to cross the crevasse will depend on the mass of the mountain climber.
E) the minimum speed needed to cross the crevasse will depend on the weight of the mountain climber.
B
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A radar pulse returns 6.0 × 10-4 s after it was sent out and reflected by an object. What is the separation distance of the radar source and the object?
a. 1.8 × 105 m b. 9× 104 m c. 1.1 × 10-3 m d. 5.6 × 10-4 m
Mercury and the Moon appear similar, but we note that:
A) the lunar mare are darker than Mercury's intercrater plains. B) Mercury has "weird terrain" opposite its huge Caloris Basin. C) Mercury has striking lobate scarps due to the shrinking of its core. D) Mercury does not always keep the same face toward the Sun, while the Moon does have the Earthside always facing us. E) All of the above are correct.
Today, the energy resource that supplies the United States with the greatest amount of electricity is
A) oil. B) coal. C) nuclear. D) hydroelectric. E) natural gas.
A rod (length = 2.0 m) is uniformly charged and has a total charge of 5.0 nC. What is the electric potential (relative to zero at infinity) at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 22 V b. 19 V c. 16 V d. 25 V e. 12 V