•
Question 1
If object A has more mass than object B,
2 out of 2 points
Selected
Answer:
•
Question 2
d.
all of the
above
2 out of 2 points
Which statement is incorrect? The gravitational force on an orbiting
satellite due to the Earth
Selected
Answer:
Response
Feedback:
•
Question 3
e.
none of the
above
Rationale:
A - D are all true.
2 out of 2 points
Two identical cars are traveling around the same curve on a highway. One
of them is moving at 60 mph, and the other is moving at 30 mph. The
centripetal force acting on the car moving at 60 mph is
the
value of the centripetal force acting on the car moving at 30 mph.
Selected
Answer:
•
Question 4
a.
four
times
2 out of 2 points
For this situation, I push on a heavy chair.
Suppose I push very hard on the chair, and this time the chair moves and I
slip backward as well. Then the strength of the force the chair exerts on
me is
Selected
Answer:
•
Question 5
d.
equal to the force I exert on
the chair.
2 out of 2 points
The force that keeps your feet from sliding as you walk is
Selected
Answer:
•
Question 6
d.
static
friction.
2 out of 2 points
The frequency of a body oscillating from a spring on the Moon
is
the frequency of the same body oscillating from the same
spring on Earth.
Selected
Answer:
•
Question 7
c.
the same
as
2 out of 2 points
During the period of one day, the number of high tides at a given point is
about
Selected
Answer:
•
Question 8
b.
two
.
2 out of 2 points
Isaac Newton’s contributions to physics include
Selected
Answer:
•
Question 9
e.
all of the
above.
2 out of 2 points
Two identical airplanes are executing identical turns around a pylon. One
of them is moving at 200 mph, and the other is moving at 100 mph. The
centripetal force acting on the airplane moving at 200 mph is
the value of the centripetal force acting on the airplane moving at 100
mph.
Selected
Answer:
Response
Feedback:
d.
four
times
Rationale:
Centripetal force = mv
2
/ r; since v
1
= 2v
2
; the force is (2)
2
or 4
times as great.
•
Question 10
The force needed to make an object move in a circle is
2 out of 2 points
Selected
Answer:
a.
centripetal
force.
•
Question 11
2 out of 2 points
A 188-pound astronaut in a training exercise experiences an acceleration of 7.2 g's. What is the net
force (in newtons) acting on the astronaut?
Selected a.
Answer: 6,023.5 N
Response
Feedback:
Rationale:
Three part problem. First convert lb to N W = mg = 188 [1 lb] = 188 [4.45
N] = 436.6 N Next change this weight to a mass. m = W/g = (436.6 N)/(9.8 m/s 2) =
85.367 kg Finally, use Newton's 2nd Law. F = ma = (85.367 kg)(70.56 m/s 2) = 6023.5
N [rounded to one decimal place]
•
Question 12
For this situation, I push on a heavy chair.
2 out of 2 points
Suppose I push lightly on the chair, and the chair doesn’t move at all.
Then the strength of the force the chair exerts on me is
Selected
Answer:
b.
equal to the force I exert on
the chair.
•
Question 13
2 out of 2 points
A body on the surface of the Earth weighs 400 lb. The radius of the Earth
is about 4,000 miles. If this same body were placed on a 4,000-mile-high
tower, its weight would be
Selected
Answer:
d.
100
lbs.
•
Question 14
2 out of 2 points
Two forces of 4 N and 12 N act on a body simultaneously. The net force on
the body is
Selected
Answer:
Response
Feedback:
e.
impossible to tell from the given
information.
Rationale:
The directions of the forces must be known.
•
Question 15
2 out of 2 points
You roll a ball off a table and at the same time drop a second ball straight
down from the edge of table. The second ball reaches the ground
the first ball reaches the ground.
Selected
Answer:
d.
at the same time
that
•
Question 16
2 out of 2 points
When a car goes around a curve of smaller and smaller radius, the
centripetal force on it decreases.
Selected
Answer:
Fals
e
•
Question 17
2 out of 2 points
You roll a ball off a table and at the same time drop a second ball straight
down from the edge of the table. The second ball reaches the ground
before the first ball.
Selected
Answer:
Fals
e
•
Question 18
2 out of 2 points
A body is oscillating up and down at the end of a spring. Let’s consider
when the body is at the top of its up-and-down motion.
The displacement vector from the equilibrium position points up.
Selected
Answer:
Tru
e
•
Question 19
0 out of 2 points
When you jump, you accelerate upward because the floor exerts an
upward force on you.
Selected
Answer:
Fals
e
•
Question 20
An aircraft weighing 1,500 N has a mass of approximately 150 kg.
2 out of 2 points
Selected
Answer:
Tru
e
•
Question 21
2 out of 2 points
As an artillery shell travels from the gun to the target, the projectile’s
vertical speed changes, but its horizontal speed stays constant.
Selected
Answer:
Tru
e
•
Question 22
2 out of 2 points
When a car goes around a curve at twice the speed, the centripetal force
on the car doubles.
Selected
Answer:
Fals
e
•
Question 23
2 out of 2 points
Tides are caused because different parts of the Earth’s oceans are at
different distances from the Moon.
Selected
Answer:
Tru
e
•
Question 24
2 out of 2 points
A body on the surface of the Earth weighs 400 lb. The radius of the Earth
is about 4,000 miles. If this same body were placed on a 4,000-mile high
tower, its weight would be 200 lb.
Selected
Answer:
Fals
e
•
Question 25
2 out of 2 points
As you go higher and higher above the surface of the Earth, the mass of a
body stays constant.
Selected
Answer:
Tru
e
•
Question 26
15 out of 15 points
Select the closest matching pairs possible. 3 pts for each response.
o
Question Selected Match
Newton's First Law
D.
An object remains in motion or at rest unless acted
upon by an exterior Force
Newton's 2nd Law
C.
F=ma
Newton's 3rd Law
E.
If object A causes a force on object B, then object B
exerts an equal force in the opposite direction on A
Newton's Law of
Universal Gravitation
A.
Every object exerts a gravitational pull on every other
object.
Hooke's Law
B.
F=-kd
From 2 King 6:1-6, one of the disciples of Elisha was cutting a tree and the ax head fell
into the water. While we do not know how high the ax head was when it fell into the
water, we will work through a physics example of the ax head's vertical motion as if it
were dropped into the water.
o
Write your name and date. The due date of this assignment is the height
the ax head falls from in meters into the water. For example, if the due date is
July 15, then the ax head fell 15 meters to the water.
o
Write Newton’s 2
nd
Law in Equation Form.
•
Question 27
Needs Grading
o
Write the quantity and units of average gravitational acceleration on the
surface of Earth.
o
Given the ax head mentioned in the opening portion with the height being
equal in numerical value of the due day of this assignment. How long does it take
for the ax to fall to the river surface?
o
Compute the final speed of the ax when it hits the water.
Selected
Answer:
Response
Feedback:
Quiz 2
answer.docx
[None Given]
