Mastin physics chapter 3 *based of quilt*
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
(100-5)m
the time it takes a car a attain a speed of 30 m/s when accelerating from rest at 2m/s^2 is
15s
at one instant an object in free fall is moving downward at 50 m/s. One second later the speed is
60 m/s
If an object moves with constant acceleration, its velocity must
change by the same amount each second
Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is
either depending on her speed
As water drops fall at a steady rate from a leaking faucet they
get farther apart
compared with hang time on earth, hang time on the moon would be
greater
The vertical height attained by a basketball player who achieves a hang time of a full one second is about
1.2 meters
When a ball thrown straight upwards reaches the very top of its path, its acceleration is
10 m/s
If you throw a ball straight downward (in the absence of air resistance), after leaving your hand its acceleration is
10 m/s^2
a ball is projected 125 meters straight upward and then falls the same distance back to its starting point. Neglecting air resistance, its total time in the air is about
10 s
the total time it takes a projectile fired straight up at 10m/s to reach the top of its path and return to its starting point about
2 s
An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance of
250 m
A pot that falls from a ledge and hits the ground 45 m below hits the ground at
30 m/s
neglecting air resistance, how fast must you toss a ball straight up in order for it to take 6 seconds to return to its initial level
30 m/s
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
4.0 m/s
One half second after starting from rest, a freely falling object will have a speed of about
5 m/s
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is
5 m/s
A car's speed 3 seconds after accelerating from rest at 2 m/s2 is
6 m/s
your at rest in a hammock when a hungry mosquito sees an opportunity for lunch. a mild 2-m/s breeze is blowing. if the mosquito join you for lunch it should hover over you by lflyinh
against the breeze at 2-m/s
The speedometer of an automobile reads
instantaneous speed
while a car travels around a circular track at a constant speed, its
none of the above
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 is
0 m/s
A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is
1 m/s^2
A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses in
100 m farther south
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is
6 m/s
n 80-km/h airplane flying in the same direction as a 10km/h tail wind has a groundspeec of
90 km/h
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
What are vector quantities?
speed
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
the same for each bullet