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Midterm 2015 Review Packet

Autor:   •  October 15, 2018  •  2,575 Words (11 Pages)  •  503 Views

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- An ice skater applies a horizontal force to a 20.-kilogram block on frictionless, level ice, causing the block to accelerate uniformly at 1.4 meters per second2 to the right. After the skater stops pushing the block, it slides onto a region of ice that is covered with a thin layer of sand. The coefficient of kinetic friction between the block and the sand-covered ice is 0.28. Calculate the magnitude of the force of friction acting on the block as it slides over the sand-covered ice. [Show all work, including the equation and substitution with units.] [2]

[pic 27]

- A 1.0 × 103 kilogram car travels at a constant speed of 20. meters per second around a horizontal circular track. The diameter of the track is 1.0 × 102 meters. What is the magnitude of the car’s centripetal acceleration? [Show all work, including the equation and substitution with units.] [2]

[pic 28]

- A 3.0-kilogram object is acted upon by an impulse having a magnitude of 15 newton•seconds. What is the magnitude of the object’s change in momentum due to this impulse?[1] ∆p = J = 15 N∙s

- An 8.0-kilogram cart moving to the right at 4.0 meters per second about to make a head-on collision with a 4.0-kilogram cart moving to the left at 6.0 meters per second. After the collision, the 4.0-kilogram cart moves to the right at 3.0 meters per second. What is the velocity of the 8.0-kilogram cart after the collision? [Show all work, including the equation and substitution with units.] [2]

[pic 29]

- A student on an amusement park ride moves in a circular path with a radius of 3.5 meters once every 8.9 seconds. What is the students average speed? [1]

[pic 30]

- In an experiment, a 0.028-kilogram rubber stopper is attached to one end of a string. A student whirls the stopper overhead in a horizontal circle with a radius of 1.0 meter. The stopper completes 10 revolutions in 10 seconds.

- Calculate the magnitude of the centripetal force on the whirling stopper. [Show all work, including the equation and substitution with units.] [2]

[pic 31]

- Determine the speed of the whirling stopper.[1] 6.24m/s

- A 0.149-kilogram baseball, initially moving at 15 meters per second, is brought to rest in 0.040 second by a baseball glove on a catcher’s hand. What is the magnitude of the average force exerted on the ball by the glove?

[pic 32]

- On a snow-covered road, a car with a mass of 1.1 × 103 kilograms collides head-on with a van having a mass of 2.5 × 103 kilograms traveling at 8.0 meters per second. As a result of the collision, the vehicles lock together and immediately come to rest. Calculate the speed of the car immediately before the collision. [Neglect friction.]

[pic 33]

- A 1200-kilogram car moving at 12 meters per second collides with a 2300-kilogram car that is waiting at rest at a traffic light. After the collision, the cars lock together and slide. Eventually, the combined cars are brought to rest by a force of kinetic friction as the rubber tires slide across the dry, level, asphalt road surface. Calculate the speed of the locked-together cars immediately after the collision.

[pic 34]

- Calculate the magnitude of the impulse applied to a 0.75-kilogram cart to change its velocity from 0.50 meter per second east to 2.00 meters per second east.

[pic 35]

- When Earth and the Moon are separated by a distance of 3.84 × 108 meters, the magnitude of the gravitational force of attraction between them is 2.0 × 1020 newtons. What would be the magnitude of this gravitational force of attraction if Earth and the Moon were separated by a distance of 1.92 × 108 meters?

Since distance halved, Fg will quadruple. Fg = 8.0x1020 N

- Io (pronounced “EYE oh”) is one of Jupiter’s moons discovered by Galileo. Io is slightly larger than Earth’s Moon. The mass of Io is 8.93 × 1022 kilograms and the mass of Jupiter is 1.90 × 1027 kilograms. The distance between the centers of Io and Jupiter is 4.22 × 108 meters.

- Calculate the magnitude of the acceleration of Io due to the gravitational force exerted by Jupiter.[1]

[pic 36]

- Calculate the magnitude of the gravitational force of attraction that Jupiter exerts on Io.[1]

[pic 37]

- Two bowling balls, A and B, each having a mass of 7.00 kilograms, placed 2.00 meters apart. What is the magnitude of the gravitational force exerted by ball A on ball B?[1]

8.2x10-10 N

- The weight of an object was determined at five different distances from the center of Earth. The results are shown in the table below. Position A represents results for the object at the surface of Earth. The mass of Earth is 5.98 x 1024 kg.

[pic 38]

- What is the mass of the object? [1] 100 kg

- At what distance from the center of Earth is the weight of the object approximately 28 newtons? [2]

[pic 39]

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