Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision.
b. the forces act during equal time intervals.
c. the law of conservation of momentum for an isolated system is a vector equation.
d. of all of the above.
e. of only (a) and (b) above.
d
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Thermal Expansion: Suppose that a rigid aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m). If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally over the entire length, how far off the ground will the wire loop be if it remained centered on the earth? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1.
A. 7.6 mm B. 76 mm C. 76 cm D. 76 m E. 760 m
When does kinetic friction occur in trying to push a heavy object?
a. When the object is still. b. When the force you apply is smaller than the maximum static frictional force. c. Just before enough force is applied to move the object. d. When the force you apply is larger than the maximum static frictional force. e. When the force you apply is insufficient to set the object in motion.
In a fairly young star cluster, if the most massive stars are swelling up into giants, the least massive stars are:
A) also evolving off the main sequence as well. B) continuing to shine as stable main sequence stars. C) blowing off shells as planetary nebula instead. D) collapsing directly to white dwarfs. E) still evolving toward their ZAMS positions.
When a body moves in circular motion at constant speed
a. the velocity and acceleration point in the same direction. b. the velocity and acceleration point in opposite directions. c. the velocity and acceleration point perpendicular to each other. d. the acceleration is zero. e. none of the above.