A parachutist who weighs 800N is falling to Earth at constant speed. What is the upwards force of the air on the parachute?
Answers
Explanation:
A kilogram is a measure of an object's
A) weight.
B) force.
C) mass.
D) gravity.
E) center of mass.
2) Your weight is
A) actually your mass.
B) the gravitational attraction between you and the earth.
C) a property of mechanical equilibrium.
D) all of these.
E) none of these.
3) Compared to the mass of a certain object on earth, the mass of the same object on the moon is
A) less. B) more. C) the same.
4) A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
A) zero newtons.
B) equal to the weight of the puck.
C) the weight of the puck divided by the mass of the puck.
D) the mass of the puck multiplied by 9.8 meters per second per second.
E) none of these.
5) An object's weight may properly be expressed in
A) meters per second. B) kilograms.
C) newtons. D) none of the above.
6) A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
A) the same as the force on the 1-kg book.
B) 10 times as much as the force on the 1-kg book.
C) zero.
7) If an object's mass is decreasing while a constant