UARK College Physics 1 Final

Planet Razorback orbits its star in a circular orbit at a constant speed. What direction is its acceleration?

to the star

3 multiple choice options

When an object experiences acceleration, the velocity is

changing magnitude and/or direction

3 multiple choice options

In a motion diagram, if the dots get farther apart as time passes the object is

moving with an increasing speed

3 multiple choice options

Describe the acceleration experienced by a ball thrown across the room as it moves through the air, on Earth, ignoring air resistance. The acceleration

is in the downward direction the entire time it is in the air

3 multiple choice options

How many significant figures are in 0.0750

3

3 multiple choice options

Which of the following is not a vector?

speed

3 multiple choice options

A lab setup can be adjusted to launch balls horizontally from the same height from the same height at 10 m/s or 20 m/s. Which setting results in the ball being in the air the largest amount of time? Assume no air resistance.

the balls hit the floor in the same amount of time

3 multiple choice options

As a box slides up a frictionless incline on Earth, what can be said about its acceleration?

the acceleration is down the slope

3 multiple choice options

How is 0.0002460 correctly rewritten in scientific notation?

2.460x10^-4

3 multiple choice options

A golf ball is hit into the air. Ignore air resistance. As it moves in its trajectory toward its highest point (x is horizontal, and y is vertical)

Vy decreases Vx is constant

3 multiple choice options

You throw a ball for your dog to chase. What happens to the horizontal component of the velocity, Vx, as it moves through the air? Assume there is no air resistance.

it is constant

3 multiple choice options

You ask your roommate to toss you a book from the other side of the room. As you watch it move through the air you realize that at its highest point

the acceleration is down, and the velocity is horizontal

3 multiple choice options

A ball rolls across a table with no acceleration. This means the

velocity is constant

3 multiple choice options

Ball A is launched at 20 m/s at an angle of 30 degrees above the horizontal. Ball B is launched at 20 m/s at an angle of 75 degrees above the horizontal. Which one has a larger maximum height?

ball B

3 multiple choice options

You throw a ball straight up into the air. What can be said about the motion at the highest point?

velocity is zero, and acceleration is not zero

3 multiple choice options

A rock in deep space, far from other objects, moves in a straight line at a steady 26 m/s. What can be said about the forces acting on the rock?

no forces are acting on the rock, or the net force is zero

3 multiple choice options

You are sliding a table across a stage in preparation for a presentation. If the force you apply is angled at 25 degrees below the horizontal, how does the normal force of the floor on the table compare to the weight of the table?

normal is larger than the weight

3 multiple choice options

A car is traveling at a constant 24 m/s on a level road. What is the linear speed at the top and bottom of a tire?

top is 48 m/s, bottom is 0 m/s

3 multiple choice options

Three forces of equal magnitude are applied to a door separately. Force A is perpendicular to the door half-way between the hinges and the doorknob. Force B is perpendicular to the door at the doorknob. Force C is at a 45 degree angle to the door at the doorknob. Which force produces the largest torque about the hinges?

Force B produces the largest torque

3 multiple choice options

The normal force on a stationary book with mass M on a ramp at an angle theta above the horizontal is

Mgcos(theta)

3 multiple choice options

You are pulling a chair up a ramp into a moving van. The chair is moving at a constant speed. What direction is the net (total) force on the chair?

the net force is zero

3 multiple choice options

Two small balls with the same mass attract each other gravitationally with a force of F. If the mass of each ball increases by a factor of 4, but the distance between them remains the same, what is the magnitude of the gravitational force on each one?

16F

3 multiple choice options

You throw 2 balls with the same amount of force. The red ball has 2 times the mass of the green ball. How do the accelerations of the two balls compare?

the green ball has two times the acceleration of the red ball

3 multiple choice options

For a ball to move at a constant speed along a circular path, the acceleration it experiences must

point directly at the center of the circle

3 multiple choice options

Phobos is a small moon orbiting Mars. Which one experiences a larger gravitational force?

they experience the same gravitational force

3 multiple choice options

You want to slide a heavy chair to the other side of a carpeted room. Which requires a larger force, getting it moving, or keeping it moving? Why?

getting it started because μs>μk

3 multiple choice options

A disk is spinning about its center at a constant rate. A purple dot is at the edge of the disk and a yellow dot is halfway between the edge and the center. What can be said about the motion of the dots?

The dots have the same angular velocity, but the purple dot has a larger tangential velocity

3 multiple choice options

A child swings a ball on the end of a string in a vertical circle. At the moment the ball is moving up and the string is horizontal the string breaks. What happens to the ball?

It goes straight up in the air

3 multiple choice options

You drop a shoe on the floor. Which one experiences the larger force during the collision?

They experience the same force.

3 multiple choice options

Two small balls with the same mass attract each other gravitationally with a force of F. If the distance between the balls decreased to 1/5 of the original, but the masses remain the same, what is the magnitude of the gravitational force on each one?

25F

3 multiple choice options

Students C and D do the same amount of work, but C does it in 1/3 the time of D. C's power output is

3 times D

3 multiple choice options

A cat sits near the end of a board with two supports beneath it. What must be true for the board to be in static equilibrium?

net torque and net force are zero

3 multiple choice options

A red ball and a blue ball have the same mass. The blue ball bounces very well, but the red ball sticks to the floor and doesn't bounce at all. They are dropped from the same height. Which statement below is true about their interactions with the floor?

The blue ball has a larger change of momentum than the red ball.

3 multiple choice options

A student sits on a spinning lab stool (frictionless axle) with her arms down by her side. As she spins, she straightens her arms out to her sides. What happens to her moment of inertia and angular velocity?

moment of inertia increases and angular velocity decreases

3 multiple choice options

As cold milk is stirred into hot coffee, the entropy

increases

3 multiple choice options

A ball launcher is used in the lab to launch 3 balls at the same speed from the same height. The green ball is launched straight up, the pink ball horizontally, and the orange ball is launched straight down. If there is no air resistance which ball reaches the ground with the largest speed?

all reach the floor at the same speed

3 multiple choice options

Two balls are dropped to the floor from the same height. One has a mass of 100 g. The other has a mass of 600 g. How does the change of potential energy compare for the two?

The change for the 600 g ball is 6 times that of the 100 g ball.

2 multiple choice options

A football is kicked into the air on Earth. If the system is only the ball, what is the sign of the work done by gravity as the ball goes up and then comes back down?

negative on the way up, positive on the way down

3 multiple choice options

A 430 N force is applied to 2 steel cables, that are the same diameter. One is 0.6 m long and the other is 1.2 m long. Which one stretches the most?

the 1.2 m cable

3 multiple choice options

Two concrete posts are the same height but have different diameters, 25 cm and 15 cm. An 85 kg box is balanced on each post separately. Which post will compress more?

the 15 cm post

3 multiple choice options

Which of these is a larger change temperature, 1.5°F, 1.5°C or 1.5 K?

1.5°C and 1.5 K are the same change and larger than 1.5° F.

3 multiple choice options

A ball is thrown straight up in the air with a velocity v (kinetic energy K) and it reaches a height H. How high will it rise if the initial speed is tripled?

9H

3 multiple choice options

Doof and Shmirtz are trying unsuccessfully to move a large rock. Doof pushes for 2 minutes with a force of 800 N. Shmirtz pushes for 4 minutes with a force of 400 N. Compare the amount of work they each do on the rock.

neither does any work

3 multiple choice options

A small box slides across a smooth (frictionless) floor and collides with a large stationary box. Neither mass is known. The two boxes stick together. What can be said about the momentum of the boxes after the collision?

the momentum of the system is conserved but not each box

3 multiple choice options

Two objects collide and stick together. Which statement about momentum is true?

Final total momentum is equal to initial total momentum.

3 multiple choice options