Physics Exam 1 Answers Questions with Detailed
Verified Answers
All except one of the following require the application of
a net force. Which one is the exception?
✓✓ Maintaining an object in motion at a constant
velocity
Suppose a theory is used to make a prediction. A
measurement is carried out to test the prediction. The
measurement is found to have a value far larger than the
prediction. This means
✓✓ the theory might have correct elements but must
be modified to account for some unforeseen
influences.
The erroneous idea that an object needs a force on it to
keep moving even at constant velocity was held by
✓✓ Aristotle.
An elevator of mass 500 kg is caused to accelerate
upward at 4.0 m/s2 by a force in the cable. What is the
force exerted by the cable?
✓✓ 6,900 N
, A new system of units is invented where the basic unit of
length is the "dak." The "dak" is defined as equal to 6
inches, and there are 2.54 centimeters in an inch. How
many "daks" are there in a centimeter?
✓✓ 0.0656
A quantity that is a measure of how the velocity of a
body changes with time is
✓✓ acceleration.
A man standing on a bridge throws a stone horizontally
with a speed of 80 m/s. The stone hits the water below 7.0
s later. The bridge is
✓✓ 240.10000000000002 m high.
Suppose you throw a ball vertically downward with a
speed of 50 m/s. Neglecting air friction, what would be
the speed of the ball one second later?
✓✓ 60 m/s
Suppose a graph of displacement of a body versus time
is constructed. The slope of the graph at any point may
be identified with
✓✓ instantaneous velocity
Verified Answers
All except one of the following require the application of
a net force. Which one is the exception?
✓✓ Maintaining an object in motion at a constant
velocity
Suppose a theory is used to make a prediction. A
measurement is carried out to test the prediction. The
measurement is found to have a value far larger than the
prediction. This means
✓✓ the theory might have correct elements but must
be modified to account for some unforeseen
influences.
The erroneous idea that an object needs a force on it to
keep moving even at constant velocity was held by
✓✓ Aristotle.
An elevator of mass 500 kg is caused to accelerate
upward at 4.0 m/s2 by a force in the cable. What is the
force exerted by the cable?
✓✓ 6,900 N
, A new system of units is invented where the basic unit of
length is the "dak." The "dak" is defined as equal to 6
inches, and there are 2.54 centimeters in an inch. How
many "daks" are there in a centimeter?
✓✓ 0.0656
A quantity that is a measure of how the velocity of a
body changes with time is
✓✓ acceleration.
A man standing on a bridge throws a stone horizontally
with a speed of 80 m/s. The stone hits the water below 7.0
s later. The bridge is
✓✓ 240.10000000000002 m high.
Suppose you throw a ball vertically downward with a
speed of 50 m/s. Neglecting air friction, what would be
the speed of the ball one second later?
✓✓ 60 m/s
Suppose a graph of displacement of a body versus time
is constructed. The slope of the graph at any point may
be identified with
✓✓ instantaneous velocity
