physics

what is the average acceleration of a car that goes from rest to 60 km/h in 8 seconds?

7.5 km/h(s)

(on the test) a ball is thrown vertically upward with an initial velocity of 39.0m/s. Determine the peak height that the object will reach.

77.6m

A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.

8.11 m/s^2

A motorist travels for 3.0 hr at 80 km/hr and 2.0 hr at 100 km/hr. What is her average speed for the trip?

88 km/hr

The Teenage Mutant Ninja Turtle, Raph , jumps from a second story building to save a child from a fire. The building is 9 meters tall. what was his velocity just before landing?

-13.13m/s (downward direction)

a truck is traveling at a constant speed of 40.0km/hr and applies the breaks to come to a complete stop in 5.0s. Calculate the average acceleration for the truck.

-2.224 m/s^2 (negative indicates direction- slowing down)

a stone is dropped into a deep well and is heard to hit the water 3.41s after being dropped. Determine the depth of the well

-56.97m (or meters deep)

A pencil lies on your desk. If the Earth is moving around the sun at a speed of 30 km/s, how fast is the pencil moving relative to the desk? How fast is the pencil moving relative to the sun?

0 km/s; 30 km/s

A ball is thrown straight up. At the top of its path its instantaneous speed is

0 m/s

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, and 6 meters again during the third second. Its acceleration is

0 m/s^2

A car accelerates at 2 m/s^2. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 20 m/s?

10 seconds

A dragster accelerates to a speed of 112 m/s over a distance of 398 m. Determine the acceleration (assume uniform) of the dragster.

15.76 m/s^2

A crate falls from an airplane flying horizontally at an altitude of 1250 m. Neglecting air drag, how long will the crate take to strike the ground?

15.8 s

A bullet leaves a rifle with a muzzle velocity of 5.21 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m. Determine the acceleration of the bullet

161572 m/s^2

a plane flying at the speed of 150 m/s is accelerated uniformly at the rate of 5.00m/s^2. What is the distance it has traveled after 10s? (hint: find v after 10s)

1750m

a baseball is popped straight into the air and has a hang-time of 6.25 s. Determine the height to which the ball rises before it reaches its peak. (Hint: Must find V0 first, then find height)

191.40m

A plane has a takeoff speed of 88.3 m/s and requires 1365 m to reach that speed. Determine the acceleration of the plane and the time required to reach this speed.

2.68 m/s^2 & 30.9s

A jet on an aircraft carrier can be launched from 0 to 40 m/s in 2 seconds. What is the acceleration of the jet?

20 m/s

a car traveling at 22.4 m/s skids to a stop in 2.55s. Determine the skidding distance of the car.( Hint: find acceleration first)

28.58m

starting from rest, a car undergoes a constant acceleration of 6 m/s^2. How far will the car travel in the first second?

3 m

A bicycle travels 15 km in 30 minutes. What is its average speed?

30 km/hr

A skateboarder starting from rest accelerates down a ramp at 2 m/s^2 for 2 seconds. What is the final speed of the skateboarder?

4m/s

A car starts from rest and after 7 seconds it is moving at 42 m/s. what is the cars average speed?

6 m/s ^2

Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is

60 km/h

a supersonic jet flying at 200.0 m/s is accelerated uniformly at the rate of 23.1m/s^2 for 20.0 seconds. What is it's final speed?

662 m/s

If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?

Neither-they will reach the bottom at the same time

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

The coin

When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?

about 10 m/s^2

One possible unit of speed is

all of the above

When you look at the speedometer in a moving car, you can see the car's

instantaneous speed

A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s^2. Determine the time for the feather to fall to the surface of the moon.

t = 1.295s

The observation deck of tall skyscraper 370 m above the street. Determine the time required for a penny to free fall from the deck to the street below.

t= 8.7s

Acceleration is defined as the CHANGE in

velocity divided by the time interval

suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. which of the following is NOT true?

your velocity is constant