A planet orbiting the Sun has speed v = ?(GM/d). Escape speed from the Sun is v = ?v(2GM/d), where G is the gravitational constant, M is Sun's mass, and d is the distance from the Sun
Noting that this tells us that escape speed is ?2 times orbital speed, which planet would fly out of the solar system by a 1.5 increase in orbital speed?
A) Mercury.
B) Venus.
C) Earth.
D) all of the above
E) none of the above
Answer: D
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In an isochoric process, the internal energy of a system decreases by 50J. What is the heat exchange?
A. zero B. +50 J C. -50 J D. none of the above
Why was the globular cluster M13 selected as the target for the 1974 Arecibo message?
A) globular clusters are the most likely place to find stars with planetary systems B) stars in globular clusters are rich in heavy elements, the building blocks of life C) signals from advanced civilizations have previously been detected coming from this cluster D) globular clusters are densely packed with stars, hence maximizing the probability of interception by an advanced civilization
A current loop is oriented in three different positions relative to a uniform magnetic field. In position 1 the plane of the loop is perpendicular to the field lines. In position 2 and 3 the plane of the loop is parallel to the field as shown. The torque on the loop is maximum in
a.
position 1.
b.
position 2.
c.
position 3
d.
positions 2 and 3.
e.
all three positions.
The frictional force of the floor on a large suitcase is least when the suitcase is
A. pushed by a force parallel to the floor. B. dragged by a force parallel to the floor. C. pulled by a force directed at an angle ? above the floor. D. pushed by a force directed at an angle ? into the floor. E. turned on its side and pushed by a force parallel to the floor.