PLEASE help me with these Momentum and Physics problems?
Please I would really appreciate it if you could help me with these physics problems. Yes I know these problems are kind of long, very sorry about that..
If you could help me with these problems I would love you like forever because I really would like to understand them better, and if you can help me with these then I would consider you an ultimate lifesaver and cherish you because you are so kind to help me. If you could help me with these today, that would be so wonderful because I really need these to review for this test I’m having tomorrow…. Thanks in advance for your help.
1.) The acceleration due to gravity on the surface of planet X is 19.6 meters per second squared. If an object on the surface of this planet weighs 980.0 newtons, the mass of the object is
a. 50.0 kg b. 100. kg c. 490. kg d. 908 N
2.) Two weightlifters raise identical 50.-kilogram masses above their heads. Weight lifter A lifts the mass 1.5 meters, while Weight lifter B lifts the mass 2.0 meters. What conclusion can be drawn about the work done by the weightlifters?
a. Weight lifter B does more work
b. Weight lifter B is taller
c. Weight lifter A does more work
d. Both weight lifter A and B do the same amount of work because they are lifting the same mass
3.) The magnitude of the momentum of an object is 64.0 kilogram-meter per second. If the velocity of the object is doubled, the magnitude of the momentum of the object will be
a. 32.0 kg-m/sb. 64.0 kg-ms/sc. 238 km-ms/sd. 256 kg-m/s
4.) A circus worker uses a pulley with a 10-m rope to lift a 900-N tiger to a 5-m platform. His effort force is 450 N. What is the mechanical advantage of the pulley?
a. 1/2b. 1c. 2d. 4
5.) A 600-newton man climbing a rope a distance of 2 meters in 1 second develops power at the rate of
a. 12 Wb. 600 W c. 300 W d. 1200 W
6.) A ball is thrown at an angle to the horizontal. What happens to the ball’s vertical acceleration during the tim the ball is in the air?
a. It decreases, then increasesb. It decreases, then remains the samec. It increases, then decreasesd. It remains the same
7.) A 3.0-kilogram steel block is at rest on a frictionless horizontal surface. A 1.0 kilogram lump of clay is propelled horizontally at 6.0 meters per second toward the block. Upon collion, the clay and steel block stick together and move to the right with a speed of
a. 1.5 m/sb. 2.0 m/sc. 3.0 m/sd. 6.0 m/s
8.) Air bags help to minimize injuries by providing a large area for the force of impact to be exerted. In terms of the impulse-momentum theory, what is another advantage of an air bag?
a. decreases the momentum of the passengerb. increases the amount of time the force is appliedc. decreases the time of impact applied by the air bag
or d. increases the implusive force applied to the passenger
9.) A force of 1000 N is exerted on a golf ball for 0.005 s. The change in momentum of the golf ball is
a. 5 kg m/sb. 50 kg m/sc. 5000 kg m/sd. 200,000 kg m/s
10.) Which of the following is the minimum amount of work done by the hydraulic lift to raise a 1700 kg automobile 2.0 m vertically?
a. 850 Jb. 3400 Jc. 8300 Jd. 33000 J
11.) A ball is thrown horizontally from the top of the building with an initial velocity of 15 meters per second. At the same instant, a second ball is dropped from the top of the building. The two balls have the same
a. path as they fallb. final velocity as they reach the groundc. initial horizontal velocityd. initial vertical velocity
12.) Which of the following is most useful in determining the kinetic energy of a 75 g battery-powered car traveling a distance of 25 m?
a. force probeb. voltmeterc. meterstickd. stopwatch
13.) Which of the following lists all the tools needed to determine the amount of work done in stretching a rubber band?
a. spring scale and rulerb. platform balance and probec. metal wire and meter stickd. hanging mass and thermometer
14.) A person moves a large box across a level floor by applying a horizontal force of 300 N. If the person pushes the box a distance of 6 meters in 10 seconds, how much work does the person do on the box?
a. 180 joulesb. 200 joulesc. 1800 joulesd. 18000 joules
15.) A 10-kilogram ball is fired with a velocity of 500 meters per second from a 1,000 kilogram cannon. What is the recoil velocity of the cannon?
a. 5 m/secb. 2 m/secc. 10 m/secd. 500 m/sec
16.) A 120 kg lineman moving right at 2 m/s tackles an 80 kg football fullback moving left at 8 m/s. After the collision, both players move left at 2 m/s. What is the momentum of the players after teh collision?
a. momentum of lineman= 240 kg m/s and momentum of fullback =160 kg m/s
b. momentum of lineman=240 kg m/s and momentum of fullback= 640 kg m/s
c. momentum of lineman= 720 kg m/s and momentum of fullback= 320 kg m/s
d. momentum of lineman= 400 kg/m/s and momentum of fullback= 400 kg m/s
17.) A baseball player throws a ball horizontally. Which statement best describes the ball’s motion after it is thrown? (neglect the effect of friction)
a. It’s vertical speed remains the same, and its horizontal speed increases
b. It’s vertical speed remains the same, and its horizontal speed remains the same
c. It’s vertical speed increases, and its horizontal speed increases
d. It’s vertical speed increases, and its horizontal speed remains the same
18.) An object falls freely near the Earth’s surface. Which best represents the relationship between the object’s kinetic energy and its time of fall?
a. Kinetic energy increases at a constant rate
b. Kinetic energy decreases at a constant rate.
c. Kinetic energy decreases by time squared
d. Kinetic energy increases by time squared




