Straighterline PHY250 General Physics I
Midterm Exam (New Version June 2024)
You are sparring in karate class. Your opponent, standing directly
in front of you, throws a punch straight into your chest. What
stance will best allow you to take this punch without losing your
balance? - 100 correct answer as-left forward
A 0.500 kg steel ball is dropped from a height of 4.00 m onto a
horizontal steel slab. The collision appears elastic in that the ball
rebounds to its original height. If the collision lasts for 2.00 × 10−3
s, which of the following is the impulse imparted to the ball and
the average force applied to the ball during the collision? - 100
correct answer as-I = 8.85 kg•m / s
F = 4.43 × 103 N
A spaceship is in space and currently at rest. The directive is
given to accelerate from rest to a speed of 2.90 × 103 m / s.
If the fuel budgeted for this action is 400 kg, which of the following
is velocity of the exhaust gas required if the ship mass is 7.38
× 103 kg? - 100 correct answer as--5.5 × 104 [m /
s]
A boat pulls a water skier who weighs 127 lbs at a constant
speed. The tension in the ski rope is 125 N. The skier makes a
run that is 0.7 km down a long straight river. What is the work
done by the water skier on the boat? - 100 correct answer
as-−8.75 × 104 N • m
,Which of the following is the general definition of impulse ? - 100
correct answer as-I = squiqqle E Fdt
A pendulum bob has mass of 0.750 kg and is on a pendulum arm
of length 1.00 m. The pendulum is pulled back so that the arm
makes an angle of 60.0° from the vertical and is then released.
Which of the following is the speed of the mass when it reaches
its lowest point? - 100 correct answer as-3.13 m/s
An automobile of mass 900 kg is moving at a speed of 12.5 m/s
when it encounters a hill. At the bottom of the hill the car speed
increases to 14.6 m/s. If the elevation of the hill is 15.3 m, how
much work did the brakes do while going down the hill? - 100
correct answer as--1.09x105 J
In a game of marbles, a 60 g marble is rolling at 8.00 cm / s when
it collides with a stationary marble. the 60 g marble takes off at a
27° angle at a reduced speed of 4.89 cm / s. The second marble
moves at a rate of 3.21 cm / s at a 31.7° angle. Which of the
following is the mass of the second marble? - 100 correct
answer as-0.0800 kg
Which of the following is not a unit of power? - 100 correct
answer as-Watt / second
A freight train is traveling at a speed so that the angular velocity of
its wheels is 38 rad / s. The engineer decides to accelerate the
train to a speed 1.5 times faster than before. If the acceleration of
the train corresponds to an angular acceleration of 0.80 rad / s2,
how long does it take for the train to reach its new speed? - 100
correct answer as-24 s
,Which of the following is a form of Hooke's law, where Fs is a
spring force? - 100 correct answer as-Fs = -kx
Which of the following objects has the greatest kinetic energy? -
100 correct answer as-an object of mass 2m and speed
3v
Cats have amazing control over their bodies. If you hold a cat
upside down a moderate height off the floor and drop it, it
manages to right itself in midair and land on its feet. Isn't this a
violation of the conservation of angular momentum? After all, the
cat starts upside down, and then it somehow rotates until it is
right-side up. Which of the following is the most plausible
explanation for this phenomenon? - 100 correct answer
as-By manipulating its body, a cat can control the moment of
inertia of different parts of its body in such a way that it can
reorient itself in midair despite the fact that its angular momentum
is zero the whole time.
Which of the following is not a vector quantity? - 100 correct
answer as-power
Tom and Joe are trying to fly a new style of kite that they have
invented. Both of them are holding strings attached to the kite.
The tension in each string is 126 N. The angle between the
strings is 36°. Unfortunately, the kite will not rise in the air, and the
strings held by Tom and Joe are essentially parallel to the ground.
Tom and Joe have run a distance of 100 m trying to get the kite to
fly. How much work have they done on the kite? - 100
correct answer as-24,000 N • m
, A car is decelerating from 60 mph to 0 mph in 122 ft. If the tires
have a diameter of 18 in., how many revolutions do the wheels
make during the deceleration? - 100 correct answer as-
25.9 revolutions
This diagram illustrates a water molecule (H2O). The oxygen
atom has a mass of roughly 16 units, and the hydrogen atoms
each have a mass of roughly 1 unit. The distance between the
oxygen and hydrogen nuclei is 0.96 angstroms (an angstrom,
denoted Å, is equal to 10−10 m). If the oxygen atom is located at
y = 0, where is the vertical position of the center of mass of the
molecule? Assume that hydrogen atoms lie towards positive y. -
100 correct answer as-0.063 Å
A force is applied to an object as shown. What is the direction of
the torque vector? - 100 correct answer as-into the
screen
The integral (squiggle)dt is called the angular impulse. It is equal
to - 100 correct answer as-the change in angular
momentum
A truck weighing 1000 N moves at 5.89 m / s when it has an
elastic collision with another vehicle. The second vehicle,
weighing 981 N, was stationary but free to move. Which of the
following is the final velocity of the first vehicle after the collision?
- 100 correct answer as-v1 f = 0.0565 m / s
Which of the following statements concerning friction is incorrect?
- 100 correct answer as-The force of static friction ( fs )
between parallel surfaces in contact is given by: fs = μsN.
Midterm Exam (New Version June 2024)
You are sparring in karate class. Your opponent, standing directly
in front of you, throws a punch straight into your chest. What
stance will best allow you to take this punch without losing your
balance? - 100 correct answer as-left forward
A 0.500 kg steel ball is dropped from a height of 4.00 m onto a
horizontal steel slab. The collision appears elastic in that the ball
rebounds to its original height. If the collision lasts for 2.00 × 10−3
s, which of the following is the impulse imparted to the ball and
the average force applied to the ball during the collision? - 100
correct answer as-I = 8.85 kg•m / s
F = 4.43 × 103 N
A spaceship is in space and currently at rest. The directive is
given to accelerate from rest to a speed of 2.90 × 103 m / s.
If the fuel budgeted for this action is 400 kg, which of the following
is velocity of the exhaust gas required if the ship mass is 7.38
× 103 kg? - 100 correct answer as--5.5 × 104 [m /
s]
A boat pulls a water skier who weighs 127 lbs at a constant
speed. The tension in the ski rope is 125 N. The skier makes a
run that is 0.7 km down a long straight river. What is the work
done by the water skier on the boat? - 100 correct answer
as-−8.75 × 104 N • m
,Which of the following is the general definition of impulse ? - 100
correct answer as-I = squiqqle E Fdt
A pendulum bob has mass of 0.750 kg and is on a pendulum arm
of length 1.00 m. The pendulum is pulled back so that the arm
makes an angle of 60.0° from the vertical and is then released.
Which of the following is the speed of the mass when it reaches
its lowest point? - 100 correct answer as-3.13 m/s
An automobile of mass 900 kg is moving at a speed of 12.5 m/s
when it encounters a hill. At the bottom of the hill the car speed
increases to 14.6 m/s. If the elevation of the hill is 15.3 m, how
much work did the brakes do while going down the hill? - 100
correct answer as--1.09x105 J
In a game of marbles, a 60 g marble is rolling at 8.00 cm / s when
it collides with a stationary marble. the 60 g marble takes off at a
27° angle at a reduced speed of 4.89 cm / s. The second marble
moves at a rate of 3.21 cm / s at a 31.7° angle. Which of the
following is the mass of the second marble? - 100 correct
answer as-0.0800 kg
Which of the following is not a unit of power? - 100 correct
answer as-Watt / second
A freight train is traveling at a speed so that the angular velocity of
its wheels is 38 rad / s. The engineer decides to accelerate the
train to a speed 1.5 times faster than before. If the acceleration of
the train corresponds to an angular acceleration of 0.80 rad / s2,
how long does it take for the train to reach its new speed? - 100
correct answer as-24 s
,Which of the following is a form of Hooke's law, where Fs is a
spring force? - 100 correct answer as-Fs = -kx
Which of the following objects has the greatest kinetic energy? -
100 correct answer as-an object of mass 2m and speed
3v
Cats have amazing control over their bodies. If you hold a cat
upside down a moderate height off the floor and drop it, it
manages to right itself in midair and land on its feet. Isn't this a
violation of the conservation of angular momentum? After all, the
cat starts upside down, and then it somehow rotates until it is
right-side up. Which of the following is the most plausible
explanation for this phenomenon? - 100 correct answer
as-By manipulating its body, a cat can control the moment of
inertia of different parts of its body in such a way that it can
reorient itself in midair despite the fact that its angular momentum
is zero the whole time.
Which of the following is not a vector quantity? - 100 correct
answer as-power
Tom and Joe are trying to fly a new style of kite that they have
invented. Both of them are holding strings attached to the kite.
The tension in each string is 126 N. The angle between the
strings is 36°. Unfortunately, the kite will not rise in the air, and the
strings held by Tom and Joe are essentially parallel to the ground.
Tom and Joe have run a distance of 100 m trying to get the kite to
fly. How much work have they done on the kite? - 100
correct answer as-24,000 N • m
, A car is decelerating from 60 mph to 0 mph in 122 ft. If the tires
have a diameter of 18 in., how many revolutions do the wheels
make during the deceleration? - 100 correct answer as-
25.9 revolutions
This diagram illustrates a water molecule (H2O). The oxygen
atom has a mass of roughly 16 units, and the hydrogen atoms
each have a mass of roughly 1 unit. The distance between the
oxygen and hydrogen nuclei is 0.96 angstroms (an angstrom,
denoted Å, is equal to 10−10 m). If the oxygen atom is located at
y = 0, where is the vertical position of the center of mass of the
molecule? Assume that hydrogen atoms lie towards positive y. -
100 correct answer as-0.063 Å
A force is applied to an object as shown. What is the direction of
the torque vector? - 100 correct answer as-into the
screen
The integral (squiggle)dt is called the angular impulse. It is equal
to - 100 correct answer as-the change in angular
momentum
A truck weighing 1000 N moves at 5.89 m / s when it has an
elastic collision with another vehicle. The second vehicle,
weighing 981 N, was stationary but free to move. Which of the
following is the final velocity of the first vehicle after the collision?
- 100 correct answer as-v1 f = 0.0565 m / s
Which of the following statements concerning friction is incorrect?
- 100 correct answer as-The force of static friction ( fs )
between parallel surfaces in contact is given by: fs = μsN.
