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Semester Review 3 Flashcards | StudBud
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Semester Review 3
Semester Review 3
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Questions
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Answers
1
A sheet of paper can be pulled from under a milk jug if it is jerked quickly because
the milk jug has very little weight
gravity pulls very hard on the milk jug
the milk jug has inertia
none of the above
2
The ratio of useful work output to total work input is called the
mechanical advantage
efficiency
pivot point
lever arm
3
Suppose a plane flies at 170 km/h, and there is a 60 km/h tailwind. The plane's speed is
230 km/h
170km/h
60 km/h
110 km/h
4
A pulley has
two
supporting strands. To lift a load 1 meter, a person will have to pull
1/4 m
2 m
1 m
1/2 m
5
How much farther will a car going 100 km/s skid than the same car going 50 km/s?
four times as far
twice as far
Half as far
the same distance
6
At what other angle will a ball thrown go the same distance as one thrown at 75 degrees.
90 degrees
15 degrees
115 degrees
65 degrees
7
A rock is dropped and falls freely with an acceleration of
g.
If it's thrown at an angle,find
g
larger than g
smaller than g
0
g downward
8
Energy is changed from one form to another with no net loss or gain.
always true
sometimes true
always false
9
If all people, animals, cars and trucks began to walk or run towards the east, then
Earth's spin would not be affected at all
Earth would spin a bit slower
Earth would spin a bit faster
10
When Lebron jumps to make a shot, once his feet are off the floor, his acceleration
is g no more, no less
is usually greater for taller players
varies with body orientation
depends on launch speed
11
Suppose a moving car has 3000 J of KE. If the car's speed doubles, what will the KE become?
6000 J
12,000 J
1500 J
1000 J
12
When a train rounds a banked curve, the centripetal force comes from the
vertical component of the normal force
normal force
horizontal component of the normal force
none of the above
13
Two gliders of the same mass slide together and stick head-on. The two will have a speed of
twice the original speed
one half the original speed
zero
the same as the original speed
14
A ball is fired into the air. It travels 5 m in the first second. How far in the next second?
more than 5 m
need more info
less than 5 m
5 m
15
Torque is defined as_____
mass times acceleration
force times lever arm
mass times velocity
force times time
16
A rock is thrown vertically into the air. At the top of the trajectory the net force on it is
its weight
less than its weight
more than its weight
17
Which has more rotational inertia, a bike wheel or a solid disk of the same mass and diameter?
the wheel
the disk
they both have the same rotational inertia
18
A ring, a disk, and a solid ball all with the same masses roll down a hill. Which one wins?
the ball
the ring
the disk
depends on what each is made of
19
A ball is thrown straight up at 10 m/s.
Ideally
, the ball will return with a speed of
5 m/s
0 m/s
20 m/s
10 m/s
20
When representing velocity as a vector
the direction of the arrow shows the direction of motion
all of the above
the length of the vector represents the speed
the length of the arrow is drawn to a suitable scale
21
Based on stability concepts, you would expect a very broad tree to have
exceptionally strong roots
a very broad root system
very deep roots
22
A cannon ball is shot at 60 m/s horizontally from a tower. Where is the ball 1 s later?
300 m downrange
30 m downrange
60 m downrange
6 m downrange
23
If you lift 1 load up 2 stories,how much work do you do compared to lifting 1 load only 1 story
four times as much
one half as much
twice as much
one quarter as much
24
If a horse pulls on a wagon, the wagon pulls equally on the horse. Will the wagon move?
No, because the forces cancel each other out
Yes, there is a time delay between action and reaction
Yes, the horse's pull on wagon is more than wagon on horse
Yes, because there is a net force on the wagon
25
A man is pulled towards the center of Earth by a 440 N force. The force that Earth is pulled is
440 N
very very large
very very small
26
A ball is thrown into the air at some angle. At the top of the ball's path, its velocity is
both vertical and horizontal
not enough info to determine
entirely vertical
entirely horizontal
27
A projectile is fired horizontally in a vacuum. The projectile keeps its horizontal speed
because the net force acting on it is zero
because it has no vertical component of speed to begin with
because it is not acted on by any horizontal forces
because it is not acted upon by anyforces
28
A bag of sports equipment has a mass of 10.0 kg and a weight of
1.0 N
100 N
1000 N
10 N
29
You push a table tennis ball beneath the surface of the water in a glass. The CG of the glass
falls
neither rises or falls
rises
30
A cannon recoils from launching. The speed of the cannon's recoil is small because the
momentum of the cannon is unchanged
cannon has far more mass than the cannonball
force against the cannon is small
impulse on the cannon is less than the impulse on the ball
