1. At a given instant in time, a 8-kg rock that has been dropped from a high cli
ID: 2133246 • Letter: 1
Question
1. At a given instant in time, a 8-kg rock that has been dropped from a high cliff experiences a force of air resistance of 30 N. What are the magnitude and direction of the acceleration of the rock? (Do not forget the gravitational force!)
magnitude __________ m/s2
direction downward/upward?
_____________________________________________________________________________________________________
2. You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is:
A. the force the Earth exerts on the scales.
B. the force the scales exert on you.
C. the force the scales exerts on the Earth.
D. the force you exert on the Earth.
E. the force you exert on the scales.
_____________________________________________________________________________________________________
3. The acceleration of gravity on the moon's surface is about 1/6 of that on the Earth's surface. An object on the Earth is to be taken to the Moon. We can state that, compared to the Earth,
A. the object's mass will be the same on the Moon.
B. the object's weight will be the same on the Moon.
C. the object's mass will be less on the Moon.
D. the object's weight will be greater on the Moon.
E. the object's mass will be greater on the Moon.
_____________________________________________________________________________________________________
4. A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because:
A. no force acts on the body.
B. a net force acts on the body.
C. it is the nature of the body to slow down by itself.
D. no net force acts on the body.
_____________________________________________________________________________________________________
5. A certain force causes a 50 kg person to accelerate at 1.0 m/s2. The same force applied to a 75 kg person would cause:
A. a greater acceleration.
B. a smaller acceleration.
C. the same acceleration.
Explanation / Answer
1) downward force due to gravity = 8 * 10 N
upward force due to air resist = 30 N
net force = 80-30 = 50 N down
acceleration = 50/8 = 6.25m/s2
2) B
3) A
4)B
5)B
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.