15 terms

# ch. 3 phys 133 hW

###### PLAY
A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second per second
is 9.8.
A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s?
15 seconds
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second , and 8 meters again during the third second. Its acceleration in meters per second per second is approximately
0
An object, at rest near the surface of a distant planet, starts to fall freely . If the acceleration there is twice that of the earth, its speed one second later would be
20 m/s.
An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of
100 m/s.
Disregarding air drag, how fast must you toss a ball straight up in order for it to take 2 seconds to return to the level from which you tossed it?
10 m/s
A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
directed downward.
A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second?
4
Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed will be
neither they will both hit with the same speed.
The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of
(100 - 4.9) m.
An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about
10 m/s
A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water
is the same for each bullet.
Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they
get farther apart.
While a car travels around a circular track at a constant speed its
acceleration is zero, inertia is zero, velocity is zero. none of these
A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval it acceleration is
zero