Physics Unit 3

It remains the same.

A ball is thrown at an angle of 38 degrees 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?

a) 10.22m/s b) 8.99m/s c) 1.84s d) 64.53m

An athlete throws the shot-put with an initial velocity of 14m/s at a 40 degree angle from the horizontal. The shot-put leaves his hand at a height of 2.2m above the ground. a) determine the horizontal component. b) Determine the vertical component. c) Determine how long the shot-put is in the air.

a) 0.5s b) 2.45m/s

The toy car in figure 6-12 runs off the edge of a table that is 1.225m high. The car lands 0.400m from the base of a table. a) How long did it take the car to fall? b) How fast was the car going on the table?

92.3m from the base of the cliff.

You accidentally throw your car keys horizontally at 8m/s from a cliff 64m high. How far from the base of the cliff should you look for the keys?

The two objects will hit the ground at the same time.

An orange is dropped at the same time a bullet is shot from a gun. What can be said?

a) 2.04s b) 9.81m/s c) 20m/s

A ball is thrown horizontally with an initial velocity of 20m/s from the top of a tower 60m high. a) What is the approximate total time required for the ball to reach the ground? b) What is the initial vertical velocity of the ball? c) What is the horizontal velocity of the ball just before it reaches the ground ?

Its vertical speed increases, and its horizontal speed remains the same.

A baseball player throws a ball horizontally. Which statement best describes the ball's motion after thrown?

a) 30.63m b) 9m

A diver running at 3.6m/s dives out horizontally from the edge of a vertical cliff and reaches the water below 2.5s later. a) how high was the cliff? b) How far from the base of the cliff did the diver hit the water?

a)25.7m/s b)76.6m

A golf ball leaves a golf club with an initial velocity of 40 meters per second at an angle of 40 degrees with the horizontal. a) What is the vertical component of the golf ball's initial velocity? b) What is the horizontal distance traveled by the golf ball during the first 2.50s of its flight?

v= 31.01m/s

A pitched ball is hit by a batter at a 45 degree angle and just clears the outfield fence, 98m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat.

a) 10.2m b) 1.02s c) 5m

A stanton football player kicks a football from ground level with an initial velocity of 20m/s at an angle of 30 degrees above the horizontal. The ball strikes the ground without being caught. (neglect air resistance and wind.) a) How high does the ball go? b) How long is the ball in the air? c) How far does the ball travel down-field before it hits the ground?

The airplane travels the same distance and will be exactly vertically above the point where the crate hits the ground.

An airplane flying at constant velocity and altitude drops a heavy crate. Ignoring air resistance, where will the plane be relative to the crate when it hits the ground?

a) 1.43s b) 496.5m

An airplane traveling 1,001m above the ocean at 125km/h is going to drop a box of supplies to ship-wrecked victims below. a) How many seconds before the plane is directly overhead should the box be dropped? b) What is the horizontal distance between the plane and the victims when the box is dropped?

a) d= 30m b) 34.3m/s

An arrow is shot at 30 degrees above the horizontal. Its velocity is 49m/s, and hits the target. a) What is the maximum height the arrow will attain? b) The target is at the height from which the arrow was shot. How fast is it?

Horizontal motion will be uniform while vertical motion will be affected due to gravity. Horizontal motion and vertical motion can be independent of each other.

Analyze how horizontal motion can be uniform while vertical motion is accelerated. How will projectile motion be affected when drag due to air resistance is taken into consideration?

-4.6m/s

You throw a baseball straight up, and it leaves your hand at 15m per second. What is its velocity 2s later? (upward motion is considered positive)

a) The time it takes for the object to hit the ground will remain constant because earth's gravity pulls on every object with the same amount of force. The object will accelerate towards the earth at 9.8m/s^2. b) The rock will hit the ground farther away from where it was thrown, if it is thrown harder, but it will still hit the ground at the same exact time as the rock thrown softer or even dropped.

You throw a rock horizontally. In a second horizontal throw, you throw the rock harder, and give it more speed. a) How will the time it takes the rock to hit the ground be affected? b) How will the increased speed affect the distance from where the rock left your hand to where the rock hits the ground?

8.4m

You took a running leap off a high-diving platform. You were running at 2.8m/s and hit the water 2.6s later. How high was the platform, and how far from the edge did you hit the water? Ignore air resistance.