Give two explanations of why a cannonball fired from a long-barrel cannon will have a greater velocity than from a shorter cannon
What will be an ideal response?
Answer: In terms of impulse-momentum, the longer barrel means the time during which the exploding powder pushes on the cannonball is longer. This means more impulse, which in turn means more gain in momentum, and greater velocity. In terms of work-energy, the longer barrel means a longer distance for the force to act, which means greater work on the ball inside the barrel and more gain in kinetic energy, and greater velocity.
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If the push that you give to a bike is the action force, then the reaction force is ________
a. the force of the bike upon you b. the weight of the bike c. the friction force on the tires d. the acceleration of the bike e. air resistance on the bike
Martian volcanoes are _______________ volcanoes with gradual slopes
Fill in the blank(s) with correct word
The study of eclipsing binary star systems provides information about the radii of stars.
Answer the following statement true (T) or false (F)
If the radius of the Earth somehow decreased with no change in mass, your weight would
A) decrease. B) increase. C) not change.