In a spaceship that accelerates at g far from gravitational influences, with the effort it takes on Earth to do 20 pushups, you could comfortably do
A) less than 20 pushups.
B) 20 pushups.
C) more than 20 pushups.
Answer: B
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A 30.0-kg object slides down a slope which is inclined 27.0° to the horizontal. What is the normal force on the object?
A) 133 N B) 171 N C) 262 N D) 387 N E) 398 N
When a crate of mass m is dragged a distance d along a surface with coefficient of kinetic friction mk, then dragged back along the same path to its original position, the work done by friction is
a. 0. b. -mkmgd. c. +mkmgd. d. -2mkmgd. e. +2mkmgd.
The light-gathering power of a telescope increases as the size of the objective increases
a. True b. False Indicate whether the statement is true or false
If two electrons are at rest a short distance apart, they will feel
A) an attractive electric force, but no magnetic force. B) a magnetic force but no electric force. C) a repulsive electric force, but no magnetic force. D) no electromagnetic forces. E) both electric and magnetic forces.