A bucket of cement is raised by a rope at constant speed at a construction
site. The upward force on the bucket supplied by the rope is - ANS ✓equal to
the force of gravity.
While in an airplane flying at 100 km/h you look down from the window
and spot another airplane flying at the same speed in the opposite
direction. Relative to you, the speed of the spotted plane is - ANS ✓200
km/h.
What did Galileo incorporate in his study of motion that Aristotle
overlooked? - ANS ✓the role of time
The gain in speed each second for a freely falling object is about - ANS ✓10
m/s
When a falling object gains 10 m/s each second, its acceleration is - ANS
✓10 m/s^2
An object is at rest. The forces acting on the object _______. - ANS ✓are equal in
magnitude
have a vector sum of zero
are opposite in direction
acceleration - ANS ✓speed/time
PHY 102
, 2
PHY
Nellie runs the length of a 100-yard football field in a time of 20 seconds.
Her average running speed is - ANS ✓5 yards/s.
The acceleration of a cart moving down an inclined plane (a ramp) - ANS
✓Constant
The equilibrium rule F = 0 applies to - ANS ✓objects or systems at rest.
objects or systems in uniform motion in a straight line.
When you stand at rest on a floor, the number of vertical forces acting on
you is - ANS ✓two
On the surface of the Moon where acceleration due to gravity is less, a
person's hang time would be - ANS ✓longer
Your weight is - ANS ✓the gravitational attraction between you and Earth.
The vertical height attained by a basketball player who achieves a hang
time of a full 1 s is about - ANS ✓1.2 m
Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has
twice as much - ANS ✓inertia.
volume.
mass.
When a skydiver of mass 100 kg experiences air resistance of 400 N, her
acceleration is - ANS ✓0.6g
first law - ANS ✓inertia
second law - ANS ✓acceleration
PHY 102
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