Final Exam ITPScience
How many km are in 2.88 m?
0.00288 km
A 1 kg turtle crawls in a straight line with a speed of 0.01 m/s. What is the turtle's momentum? p = mv
0.01 kgm/s
A ball is thrown directly upward. If it leaves your hand with a speed of 12.0 m/s, then how fast will the ball be traveling when it returns to your hand? (Assume your hand hasn't moved.)
12.0 m/s
John has 200 Joules of potential energy when he is standing on a diving board. What is his mechanical energy when he lands in the water?
200 J
Amy uses 20 N of force to push a lawn mower 10 meters. How much work does she do? W = Fd
200 Nm
How many seconds are in 2.5 days?
216,000 s
In a previous problem a first-aid kit was dropped. How fast is the first-aid kit traveling 2.5 s after it is dropped?
24.5 m/s
Fill in the missing values. PE = 25 J KE = ___ ME = ___
25 J 50 J
How many liters are in 2.52 x 10^4 mL?
25.2 L
A motor does 5,000 Joules of work in 20 seconds. What is the power of the motor? P = W/t
250 W
How many mL are in 0.258 L?
258 mL
A vehicle travels 2345 m in 315 s. What is its average speed in m/hr?
26,784 m/hr
In a previous problem a fish is dropped by a pelican. What is the speed of the fish 2.8 s after it is dropped?
27.44 m/s
A 1,400 kg car is traveling in a straight line and has a momentum of 40,000 kgm/s. What is the speed of the car? v = p/m
28.57 m/s
How long will it take to go 150km traveling at 50 km/hr?
3 hrs
A jogger starts from rest and accelerates for 4 s with an acceleration of 1.1 m/s^2. What is the jogger's speed after 4 s?
4.4 m/s
A cow escapes from a hovering UFO. If the UFO is 115 m above a pond, how long will the cow fall before it lands (safely :)) in the pond?
4.84 s
Fill in the missing values. PE= 10 J KE = ___ ME = 50 J
40 J
What is the mass of an object that requires a force of 30 N to accelerate at a rate of 5 m/s^2?
6 kg
How much force is needed to accelerate a truck with a mass of 2,000 kg at a rate of 3 m/s^2?
6,000 N
How many kL are in 8383 L?
8.383 kL
How much force is needed to accelerate a 68 kg skier at a rate of 1.2 m/s^2?
81.6 N
What is the acceleration of a 0.30 kg ball that is hit with a force of 25 N?
83.33 m/s^2
A roller coaster cart with a mass of 200 kg is at rest on its track at a height of 5 m above the ground. How much potential energy does it have? Ep = mgh
9,800 J
A roller coaster cart with a mass of 200 kg is at rest on its track at a height of 5 m above the ground. How much work was done on the cart to get it to that height?
9,800 J
An Olympic athlete runs 200.0 m in 21.34 s. What is her average speed?
9.37 m/s
What is the acceleration of the ball at its maximum height?
9.8 m/s^2
What is the acceleration of the ball?
9.8 m/s^2
A 1,000 W microwave oven takes 90 s to heat a bowl of soup. How many joules of energy does it use? W = Pt
90,000 J
A 900 N mountain climber scales a 100 m cliff. How much work is done by the mountain climber? W = Fd
90,000 Nm
What is the mass of an object that requires a force of 4,500 N to accelerate at a rate of 5 m/s^2?
900 kg
What is the SI unit for mass?
Kilograms
Jared and Clay are climbing the stairs. Jared gets tired and stops halfway to the fourth floor. Clay makes it to the fourth floor without a problem. If Jared is twice as heavy as Clay, who has more potential energy? Explain
They have the same potential energy. Jared stops half but is 2x clay, Ep depends upon both mass and height.
A table tennis (ping-pong) ball has a mass of about 2.45 g. Suppose the ball is hit across the table with a speed of about 4.0 m/s. What is its kinetic energy? Ek = 1/2mv^2
0.0196 J
The potential energy of an apple is 6.00 J. The apple is 3.00 m high. What is the mass of the apple? m = Ep/gh
0.20 kg
A ball has 17 J of kinetic energy and its mechanical energy is 25 J. If the ball has a mass of 3.2 kg, what is its height above the ground?
0.26 m
A beach ball is rolling toward you with a speed of 0.5 m/s. Its momentum is 0.25 kgm/s. What is the mass of the beach ball? m = p/v
0.5 kg
If a swimmer is able to swim 50.0 m in 55.2 s, what is his average speed?
0.906 m/s
A weight lifter lifts a set of weights a vertical distance of 2.74 m. If a constant net force of 376 N is exerted on the weights, how much net work is done on the weights? W = Fd
1,030.24 Nm
A hair dryer uses 72,000 J of work in 60 seconds. What is the power of this hair dryer? P = W/t
1,200 W
The momentum of a car traveling in a straight line at 20 m/s is 24,000 kgm/s. What is the car's mass? m = p/v
1,225 kg
How many minutes are in a day?
1,440 minutes
A toaster oven uses 67,500 J of energy in 45 s to toast a piece of bread. What is the power of the oven? P = W/t
1,500 W
Emily's vacuum cleaner has a power rating of 200 W. If the vacuum cleaner does 360,000 J of work, how long did Emily spend vacuuming? t = W/P
1,800 s
What is the density in g/mL of a substance that has a mass of 525g and has a volume of 4.52 x 10^2 mL?
1.16 g/mL
What is the acceleration of a 6.4 kg bowling ball if a force of 12 N is applied to it?
1.88 m/s^2
Calculate the acceleration of a car (in km/hr/s) that can go from rest to 100 km/hr in 10 s.
10 km/hr*s
John has 200 Joules of potential energy when he is standing on a diving board. John jumps off of the diving board. What is his potential energy when he is halfway to the water?
100 J
What is the kinetic energy of a 1.5 kg ball traveling with a speed of 12 m/s? Solve with correct units.
108 J
Fill in the missing values. PE = 200 J KE = 0 J ME = ___
200 J
What is the kinetic energy of a 3 kg ball that is rolling at 2 m/s? Ek = 1/2mv^2
6 J
A car traveling at 40 m/s slams on the brakes. If it takes 5 s for the car to completely stop, what was the car's average acceleration?
-8 m/s^2
What is the potential energy of a 3 kg ball that is on the ground? Ep = mgh
0 J
Fill in the missing values. PE = 15 J KE = ___ ME = ___
0 J 15 J
Fill in the missing values. PE = ___ KE = 200 J ME = ___
0 J 200 J
When the ball reaches its maximum height, what is its speed?
0 m/s
John has 200 Joules of potential energy when he is standing on a diving board. Find his mechanical energy.
200 J
The baseball player does 1234 Joules of work when hitting a baseball into left field. Assuming the baseball landed 100 meters away from home plate, how much force did the player use to hit the ball? F = W/d
12.34 N
What is the speed of a UFO (in m/s) that travels 250.0 km in 2.00 seconds?
125,000 m/s
Fill in the missing values. PE= 0 J KE = ___ ME = 15 J
15 J
Tommy does 15 Joules of work to push the pencil over 1 meter. How much force did he use? F = W/d
15 N
Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 3 seconds down a ramp with an acceleration of 5 m/s^2.
15 m/s
If another 0.14 kg baseball is thrown in a straight line and has a momentum of 2.1 kgm/s. What is the velocity of the ball? v = p/m
15 m/s
What is the potential energy of a 2 kg potted plant that is on a 1 m high plant stand? Ep = mgh
19.6 J
What distance will a car traveling 65 km/hr travel in 3.0 hrs?
195 km
Angela uses a force of 25 Newtons to lift her grocery bag while doing 50 Joules of work. How far did she lift the grocery bags? d= W/F
2 m
An 8 kg bowling ball is rolling in a straight line toward you. If its momentum is 16 kgm/s, how fast is it traveling? v = p/m
2 m/s
A sprinter starting from rest on a straight, level track is able to achieve a speed of 12 m/s in 6.0s. What is the sprinter's average acceleration?
2 m/s^2
Nicholas spends 20 minutes ironing shirts with his 1,800 W iron. How many joules of energy were used by the iron? (Hint: convert time to seconds.) W = Pt
2,160,000 J
It takes a clothes dryer 45 minutes to dry a load of towels. If the dryer uses 6,750,000 J of energy to dry the towels, what is the power rating of the machine? (Hint: convert time to seconds.) P = W/t
2,500 W
What is the density in g/mL of a substance that has a mass of 0.987 kg and has a volume of 4.52 x 10^2 mL?
2.184 g/mL
In 1993, Cuban athelete Javier Sotomayor set the world record for the high jump. The gravitational potential energy associated with Sotomayor's jump was 1,970 J. Sotomayor's mass was 82.0 kg. How high did Sotomayor jump? h = Ep/mg
2.45 m
An object is dropped from a vertical distance of 31.7 m above the ground, and it takes 2.54 s to fall that distance. A second identical object is launched from the same height, with a horizontal velocity of 64.0 m/s. How long does the second object take to fall the 31.7 m?
2.54 s
An object is dropped from a vertical distance of 31.7 m above the ground, and it takes 2.54 s to fall that distance. A second identical object is launched from the same height, with a horizontal velocity of 64.0 m/s. If an object is launched from the same height with a horizontal velocity of 500 m/s, how long will it take the object to hit the ground?
2.54 s
With an elevation of 5,334 m above sea level, the village of Aucanquilca, Chile is the highest inhabited town in the world. What would be the gravitational potential energy associated with a 64 kg person in Aucanquilca? Ep = mgh
3,345,484.8 J
A roller coaster cart with a mass of 200 kg is at rest on its track at a height of 5 m above the ground. Later the same 200 kg cart reaches a lower part of the track and is traveling at a velocity of 6.0 m/s. How much kinetic energy does the cart have?
3,600 J
How many seconds are in an hour?
3,600 seconds
A roller coaster cart with a mass of 200 kg is at rest on its track at a height of 5 m above the ground. Later the same 200 kg cart reaches a lower part of the track and is traveling at a velocity of 6.0 m/s. How high the cart above the ground when its speed is 6.0 m/s?
3.16 m
An angry student drops his science book from the top of his dorm. If the dorm is 51 m tall, then how long will it take the science book to hit the ground?
3.23 s
A ball has 17 J of kinetic energy and its mechanical energy is 25 J. What is the speed of the ball?
3.26 m/s
Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 5 seconds down a ramp at an acceleration of 6 m/s^2.
30 m/s
A small first-aid kit is dropped by a rock climber. After 2.5 s how far has the first-aid kit fallen?
30.63 m
How much work is required to pull a sled 5 meters if you use 60 N of force? W = Fd
300 Nm
A cheetah runs 274 m in 8.65 s. What is its average speed?
31.68 m/s
In a previous problem a pebble fell from a bridge. How fast is the pebble traveling after falling for 3.4 s?
33.32 m/s
Suppose a force of 100 N is used to push an object a distance of 5 m in 15 s. Find the work done and the power for this situation. P = W/t
33.33 W
How much does a 3.5 kg box weigh?
34.3 kg m/s^2 (N)
Fill in the missing values. PE = ___ KE = 15 J ME = ___
35 J 50 J
If a sports car with a mass of 1000 kg is also traveling down the freeway at 35 m/s, what is its momentum? p = mv
35,000 kgm/s
A fish is dropped by a pelican. After 2.8 s how far has the fish fallen?
38.42 m
How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200 N? W = Fd
4,000 Nm
A worker drops a wrench from the top of a tower 80.0 m tall. With what velocity does the wrench strike the ground? (Hint: first find the time it takes for the wrench to fall to the ground.)
4.04 s 39.59 m/s
A 0.14 kg baseball is thrown in a straight line at a speed of 0.01 m/s. What is the momentum of the baseball? p = mv
4.2 kgm/s
A 4000 kg truck is traveling at 10.0 m/s. What is its momentum? p = mv
40,0000 kgm/s
How much work is done when a force of 33 N pulls a wagon 13 meters? W = Fd
429 (Nm) (J)
A shopper in a supermarket pushes a cart with a force of 37 N. If the shopper does 1,704 J of work pushing the cart down the length of the aisle, how long is the shopping aisle? d = W/F
46.05 m
How many mL are in 0.50 quarts?
473.2 mL
An object with a mass of 8 kg is dropped and takes 5 s to hit the ground. Then another object with a mass of 16 kg is dropped from the same point. How long does it take to hit the ground?
5 s
An object with a mass of 8 kg is dropped and takes 5 s to hit the ground. Then another object with a mass of 16 kg is dropped from the same point. If a 200 kg object is dropped from the same point, how long will it take to hit the ground?
5 s
Fill in the missing values. PE = 0 J KE = ___ ME = ___
50 J 50 J
Fill in the missing values. PE = ___ KE = 0 J ME = ___
50 J 50 J
A machine does 1,500 J of work in 30 seconds. What is the power of this machine? P = W/t
50 W
A rock dropped down a well takes 3.2 s to hit the water. How far below the top of the well is the surface of the water?
50.18 m
If a rocket travels 5600 km in 3.0 hours, what is its speed in m/s?
518.52 m/s
What is the mass of a child that has a kinetic energy of 400 J who is riding her bike at 3.9 m/s?
52.60 kg
A small pebble falls off of a bridge. If the pebble falls for 3.4 s before it hits the water beneath the bridge, then how high is the bridge above the water?
56.64 m
A roller coaster cart with a mass of 200 kg is at rest on its track at a height of 5 m above the ground. Later the same 200 kg cart reaches a lower part of the track and is traveling at a velocity of 6.0 m/s. How much potential energy does the cart have now?
6,200 J
Fill in the missing values. PE = 140 J KE = ___ ME = ___
60 J 200 J
What distance will be traveled if you are goin 120 km/hr for 0.5 hrs?
60 km
In 1995, Karine Dubouchet of France reached a record speed in downhill skiing. If Dubouchet's mass was 51.0 kg, her kinetic energy would have been 99,600 J. What was her speed? v = sqrt(2Ek/m)
62.50 m/s
What is the weight of a 6.4 kg bowling ball?
62.72 kg m/s^2 (N)
A professional athelete ran a race with a constant speed of 10.2 m/s. If his kinetic energy was 3,400 J, what was his mass? m = 2Ek/v^2
65.36 kg
What is the weight of a 68 kg skier?
666.4 kgm/s^2 (N)
A 28 kg child on a swing is traveling at 4.2 m/s. What is his potential energy if he has 315 J of mechanical energy?
68.04 J
A crate falls from the door of a hovering helicopter. If the helicopter is 305 m above the road, how long does it take for the crate to fall to the road?
7.89 s
Fill in the missing values. PE = ___ KE = 130 J ME = ___
70 J 200 J
A tractor-trailer truck is traveling down the freeway at 35 m/s. If the mass of the truck is 2,000 kg what is its momentum? p = mv
70,000 kgm/s
A 1.8 kg book has been dropped from the top of the football stadium. Its speed is 4.8 m/s when it is 2.9 meters above the ground. What is its mechanical energy?
71.90 J
The Sears Tower in Chicago is 443 m tall. If Joe's average upward speed is 0.60 m/s, how long will it take Joe to climb from street level to the roof of the Sears Tower?
738.33 s
A horse moves a sleigh 1.00 km by applying a horizontal 2,000 N force on its harness for 45 minutes. What is the power of the horse? (Hint: Convert km to m & minute to seconds) P = W/t
740.74 W
How many cm are in 0.783 m?
78.3 cm
A ball has 17 J of kinetic energy and its mechanical energy is 25 J. Find the potential energy of the ball.
8 J
Fill in the missing values. PE = ___ KE = 7 J ME = ___
8 J 15 J
What is the force on a 1,000 kg elevator that is falling freely under the acceleration of gravity only?
9800 N
The cart crosses the lab bench in 3 cs. What units (in words) does "cs" represent?
Centisecond
Identical twins Rick and Chris are painting a house. Rick is standing on the scaffolding 5 meters above the ground. Chris is standing on the scaffolding 5 meters above Rick. Who has more potential energy? Explain.
Chris, the higher up you are, the more potential energy.
The diameter of Jupiter is approximately 140Mn. What units (in words) does "Mn" represent?
Megameters
What is the SI unit for distance?
Meters
What is the SI unit for time?
Seconds
What happens to the speed of the ball as it travels higher?
slows down
What happens to the speed of the ball as it falls from its maximum height toward your hand?
speeds up