AP Physics Review
A rocket is launched from level ground so that it travels a vertical trajectory. The upward velocity of the rocket is shown in the graph as a function of time. Assume there is no air resistance and that only gravity acts on the rocket once its engines start off. How high is the rocket the instant its engines shut off?
180m/s
On its own, a tow truck has a max acceleration of 3.0 m/s^2. What will be its max acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?
1.5 m/s^2
The speed of a car is increased uniformly from 20 m/s to 30 m/s in 4 seconds. The magnitude of the car's average acceleration in this 4 second interval is..
2.5 m/s^2
Solve the following problems giving the answers in correct scientific notation. 5.3x10^3 / 2.1x10^2
2.52E1
How fast is the ball moving horizontally just before striking the ground?
200 m/s
Convert the following: 242.2m into _____mm
242,200
The horizontal velocity of the ball when it reaches the highest point in its trajectory?
250cos37=191.53 191.54 -> 200 m/s
If there are 20 slices of bread in a loaf, and a bakery produces 4 x10^4 loaves in a week, how many slices are produced in a century?
4.16E9
Convert the following into scientific notation: .04500
4.5E-2
Convert the following into scientific notation: 450x10^2
4.5E4
Solve the following problems giving the answers in correct scientific notation. 6.4x10^2 + 4.2x10^3
4.84E3
A ball is shot from ground level with an initial velocity of 250 m/s directed at an angle of 53° to the horizontal. How much time elapses before the ball strikes the ground?
40 secs
A projectile is launched over level ground so that its initial velocity has components (vx=40m/s, vy=50m/s). Ignore the effects of air resistance. How far the launch point will the projectile strike the ground?
40=x/10 x=400
A 10-kg object is hanging by a very light wire in an elevator that is traveling upward. The tension in the rope is measured to be 75 N. What is the magnitude of the acceleration of the elevator?
75-100=(a)10 -125=10a a=-2 m/s
An object is thrown vertically upward from Earth's surface. Sketch the graph best shows the relationship between velocity and time as the object rises?
----
Expand the following numbers: 2.4x10^-2
.024
Convert the following: 59.5 decimeters into _____ hectometers
.0595
The value of the metric prefix centi means:
1/100
Two cars A and B are at x=0 and t=o and are traveling along a straight road (the x-axis) as shown in the graph. At what time do the cars meet again?
10 and 20 seconds Find the area under the curve to solve
A 7.0-kg object is acted on by two forces. One of the forces is 10.0 N acting toward the east. What is the other force if the acceleration of the object is 1.0 m/s^2 towards the east?
10+-x=7 x=3N
The value metric prefix hecto means:
100
The magnitude of the frictional force along the plane is
14N
A rocket is launched from level ground so that it travels a vertical trajectory. The upward velocity of the rocket is shown in the graph as a function of time. Assume there is no air resistance and that only gravity acts on the rocket once its engines start off. At what instant does the rocket each its highest height?
15 seconds Find the area under the curve to solve
Convert the following into scientific notation: 34000
3.4E4
Two cars A and B are at x=0 and t=o and are traveling along a straight road (the x-axis) as shown in the graph. At what time do the cars have the same speed going in the same direction?
5 and 15 seconds
If the speed of light is 3.00x10^8m/s, how far in miles can light travel in a millennium?
5.86E15
Starting from rest, an object rolls freely down an incline that is 10m long in 2 seconds. The acceleration of the object is approximately...
5m/s
Solve the following problems giving the answers in correct scientific notation. 3.4x10^-3 x 2.0x10^-2
6.38E-5
Expand the following numbers: 6.2x10^3
6200
Convert the following: 678.4m into ______cm
678,400 cm
Convert the following: 8.43 km into ______cm
8,430
A race car on a straight road starts from rest and accelerates to a speed of 10m/s in 2 seconds. The car then continues with this speed for 8 seconds. How far has the race car traveled during this entire interval?
90 m Use the third equation
When multiplying quantities that are expressed in scientific notation, the exponents are:
Added
Which of the following meter sticks would give the most precise measurement?
B) One the measure dot the nearest centimeter
What do acceleration and velocity have in common?
Both are vectors
Which graph(s) represent a stationary particle?
I and II
Increasing the vertical frictional force that the pole exerts on the fireman. When the force on his hands equals his weight, what happens to the fireman?
Constant velocity
An object is moving with constant non-zero velocity. Which of the following statements about it must be true?
D) The net force on the object is zero
A 2-kilogram block slides down 30° incline as shown above with an acceleration of 2 m/s^2. Which of the following diagrams best represents the gravitational force W, the frictional force f, and the normal force N, that act on the block?
E
An object is dropped from rest and falls freely 20m to Earth. When is the speed of the object 9.8 seconds?
End of the first second
A 590-kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3s?
F=T-5900=(590)(28/3.3) T=10906.06
A football player at practice pushes 65 kg blocking sled across the field at a constant speed. The coefficient of kinetic friction between the grass and the sled is .30. How much force must he apply?
F=mf F=(65)(3) F= 195
The SI (metric) base unit for mass is the:
G (grams)
Which graph(s) represent a particle moving with constant, nonzero velocity?
III
Which graph(s) represents a particle moving with a velocity that varies with time?
IV
The SI base unit for volume is:
L (liters)
Two cars A and B are at x=0 and t=o and are traveling along a straight road (the x-axis) as shown in the graph. At what time does car A return to the origin?
Never
A ball is thrown at an angle of 37° to the horizontal. What happens to the magnitude of the ball's vertical acceleration during the total time interval that the ball is in the air?
Nothing happens, it's going to stay 10m/s
When writing numbers in scientific notation, the allowable number of digits that can occur before the decimal are...
One
An object that is launched from the top of a tower is dense enough that air resistance can be ignored. The object's initial velocity has components (vx=60m/s, vy=20 m/s) What are the components of the object's velocity 5 seconds after launch?
Vx=V0=at =20+-10(5) Vy=-30 Vx=60
A projectile is launched over level ground so that its initial velocity has components (vx=40m/s, vy=50m/s). Ignore the effects of air resistance. How much time elapses before the projectile strikes the ground?
Vy=Vy0+at 50+-10(t) -50=-10t t=5 -- double it t=10
What is the magnitude of the man's displacement once he reaches point B?
a^2+b^2=c^2 80^2+60^2=c^2 6400+3600=c^2 10000=c^2 c=100
What is the magnitude of the man's average velocity for this travel?
d/t 100/100 1
A car travels 90m due north in 15s. Then the car turns around and travels 40m due south for 5s. What is the magnitude of the average velocity of the car during this 20s interval?
d/t 50/20 2.5
A moving body must undergo a change of...
position
Solve the following for r; F=mv^2/r
r=mv^2/f
A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus
slowing down.
A 1.0 kg ball is dropped from the roof of a building 40 m tall. What is the approximate time of the fall?
t=2.9 seconds Use the second equation
A .2 kg red ball is thrown horizontally at a speed of 4 m/s from a height of 3m. A .4 kg green ball is thrown horizontally from the same height at a speed of 8 m/s. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is...
the same
At the top of a building 125 meters high, a dense ball is shot horizontally such that its initial velocity is 20 m/s. How far from the base of the building will the ball strike the ground?
v=d/t 100m
At the top of a building 125 meters high, a dense ball is shot horizontally such that its initial velocity is 20 m/s. How much time elapses before the ball strikes the ground?
x=V0+Vy0(t)+1/2at^2 0=125+0t+1/2(-10)t^2 5 seconds
Solve the following for x; Y=ax=b
x=y-b/a