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Newton's laws and kinematics: forces, velocity and motion

Sanj Pandit 9 preguntas

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Preguntas del test (9)

  1. 1A man walks 30 m east and then 20 m north. What is the difference between his traveled distance and his displacement?
    1. A0 m
    2. B20 m
    3. C50 m
    4. D70 m
  2. 2A 1000 kg rocketship, travelling at 100 m/s, is acted upon by an average force of 20kN applied in the direction of its motion for 8 s. What is the change in velocity of the rocket?
    1. A160 m/s
    2. B260 m/s
    3. C160,000 m/s
    4. D260,000 m/s
  3. 3A car is traveling at 40 km/hr and the driver puts on the brakes, bringing the car to rest in a time of 6 s. What is the magnitude of the average acceleration of the car?
    1. A240 km/hr^2
    2. B12,000 km/hr^2
    3. C24,000 km/hr^2
    4. D30,000 km/hr^2
  4. 4An elevator is designed to carry a max weight of 9800 N (including its own weight) and to move upward at a speed of 5 m/s after an initial period of acceleration. What is the relationship between the maximum tension in the elevator cable and the maximum weight of the elevator while the elevator is accelerating upward?
    1. AThe tension is greater than 9800 N
    2. BThe tension is less than 9800 N
    3. CThe tension equals 9800 N
    4. DIt cannot be determined from the information given.
  5. 5At a place where g = 9.8 m/s^2, an object is thrown vertically downward with a speed of 5 m/s while a different object is thrown vertically upward with a speed of 10 m/s. Which object undergoes a greater change in speed in a time of 2 s?
    1. AThe first object has a greater change in speed.
    2. BThe second object has a greater change in speed
    3. CBoth objects undergo the same change in speed
    4. DIt cannot be determined from the information given.
  6. 6A firefighter jumps horizontally from a burning building with an initial speed of 1.5 m/s. At what time is the angle between his velocity and acceleration vectors the greatest?
    1. AThe instant he jumps.
    2. BWhen he reaches terminal velocity
    3. CHalfway through his fall
    4. DRight before he lands on the ground
  7. 7A 10 kg wagon rests on an inclined plane. The plane makes an angle of 30 degrees with the horizontal. Approximately how large is the force required to keep the wagon from sliding down the plane (Note: sin 30 = 0.5, cos 30 = 0.866)?
    1. A10 N
    2. B49 N
    3. C85 N
    4. D98 N
  8. 8Which of the following expressions correctly illustrates the SI base units for each of the variables in the formula below?
    mΔv = FΔt
    1. Alb x mph = ft x lb x s
    2. Bkg x m/s = N x s
    3. Ckg x m/s = kg(m)/s^2 x s
    4. Dg x m/s = g(m)/s^2 x s
  9. 9A 20 kg wagon is released from rest from the top of a 15 m long lane, which is angled at 30 degrees with the horizontal. Assuming that there is friction between the ramp and the wagon, how is this frictional force affected if the angle of the incline is increased?
    1. AThe frictional force increases
    2. BThe frictional force decreases
    3. CThe frictional force remains the same
    4. DIt cannot be determined from the information given.

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Test sobre Sin título, creado por Sanj Pandit el 09/07/2021.
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