Physics Exam

what is the average velocity of the objects from t=8s to t=10s

-2.5m/s

The velocity of the objects at 6s is approximately

-5 m/s

calculate the change in velocity of the cart from 0.02s to 0.07s

.125 m/s

what is the total change in the carts momentum during the time it is in contact with the elastic

0.025 kg x m/s

a turntable with a radius of 8.0cm rotates at 45 rpm. What is the linear speed of a point on the outside rim of the turntable

0.38 m/s

A ball with a diameter of 20cm is rolling across the floor with an angular velocity of 4 rad/s. How fast is the center of mass of the ball moving

0.4 m/s

a ball with mass m and radius r has a moment of inertia equal to 2/5mr^2. The ball rolls without slipping, and its center has a linear speed of v. What is the total kinetic energy

0.7mv^2

what is the net torque on the system

1.0 Nm, counterclockwise

on an air track a 1.0 kg cart moving at 2.0 /s toward the right collides with a 2.0kg cart moving at 3.0m/s to the left. After the collision the 1.0kg cart is moving at 2.0 m/s toward the left. the velocity of the 2.0 kg cart after the collision is

1.0 m/s toward the left

which quantity is not equivalent to 100m

1.00x10^6

Which is a reasonable order-of-magnitude estimate of the number of golf balls that would fill a home swimming pool

10^5

which statement uses SI unit prefixes correctly

150cm=1.5m

what magnitude must force C have in order for the system to be in equilibrium

20N

what is the displacement of the objects over the time period from t=0 to t=10s

20m

A satellite is in orbit at a distance r above earths surface. if earths radius is r and the period of the orbits is T, what is the satellites orbital speed.

2pi (R+r) over T (c)

A thin 1 m long rod has a 200 g object attached to one end and a 300 g object attached to the other end. At what point should the rod be supported so that it remains in horizontal equilibrium

40cm from the 300g object

what is the maximum altitude, or vertical displacement, of the projectile

45m

you are riding your bike northward at 5.0m/s when you see a friend standing on a corner. What is your friends velocity relative to you?

5.0 m/s toward the south

what is the displacement of the object whose motion is represented in the graph over the time period from t=0 to t=3

5m

the free body diagram below represents a car driving around a level circular curve . which set of identities correctly specifies the forces acting in the diagram

A=N B=fcp C=mg

which vector is the result of subtracting B from

C.

Which of the following is an example of motion with constant velocity?

a box sliding with a constant speed down a ramp

which of the following could be true of an object moving with constant acceleration?

all of the above

the graph of velocity versus time for an object is a straight line. Which of the following could be true?

all of the above coul dbe true

which condition result in a parabolic path for a projectile

constant acceleration in one dimension and constant velocity in the other dimension

what does the constant slope of the graph from t=0 to t=6s indicate

constant velocity

which expression gives the change in velocity

delta p/m

the gravitational force exerted on you by earth is

exactly equal in magnitude to the gravitational force you exert on earth

Which force produces the torque with the largest magnitude

force c

when short track speed skaters round a circular curve on the track they lean inward toward the center of the curve. Which is the best explanation for their use of this technique?

it creates a force between the ice and skates that acts toward the center of the track

What is not an SI base unit of measurement

kilometer

during an inelastic collision the systems kinetic energy decreases because

kinetic energy is changed to other forms of energy

the circular orbit of a space station is changed in such as way that it experiences a lower value of g. Which of the following actions led to this result.

orbit farther from earth, decrease orbital speed

an airplane is flying north with an airspeed of 200km/h when it encounters a crosswind of 70km/h toward the east. Which expression gives the resultant speed of the airplane?

square root (200km/h)^2 + (70km/h)^2

Runner A starts at x=0 and runs with a velocity of +3.0 m/s toward runner B. runner B starts at the same time at x=20 m and runs with a velocity of -2.0m/s toward runner A. where do they meet, and how much time has elapsed since they started runner?

t=4.0s and x=12

which is best explained by keplers second law of planetary motion

the increase in the orbital speed of earth as it approaches a position closer to the sun

Which statement best describes the change in motion that occur at t=6s

the object changes direction and speed

An objects equations motion is given by x=12+5t, where x is the final position. Which statement is true?

the object moves with a constant velocity of 5 m/s

which of the following is a vector quantity

torque

Object A which moving to the right with a speed v, collides head-on and elastically with an identical object, B moving to the left with a speed 2v. After the collision object A moves to the left with a speed 2v. What are the speed and the direction of motion of object B after the collision

v to the right

Use dimensional analysis to determine which of the following is not a valid equation. In these equations, d is distance, v is velocity, t is time, and a is acceleration

v^2=1/2ad^2

Which expression gives a projectiles horizontal velocity during flight if the projectile has an initial launch velocity v at an angle of 30º above the horizontal

vcos30º

When a rock is dropped from a cliff, as it falls, its

velocity increases in magnitude and acceleration remains constant

A baseball is thrown straight upward with a velocity oof 4.0 m/s. At the peak of its flight, the balls velocity

velocity is zero and acceleration is -9.81 m/s^2

which expression gives a projectiles vertical velocity during flight if the projectile is fired with a speed v at an angle of 30º above the horizontal

vsin30-gt

Which equation best describes the motion plotted on the graph

x=10+6t-t^2

use the graph to estimate the value of y when x=3

y=20

Which equation describes the line on the graph

y=2x^2