Physics Final 2019
A ball is thrown straight up. At the top of it's path its instantaneous speed is
0 m/s
suppose a car is moving in a straight line and steadily increases its speed.It moves from 30 km/h to 40 km/h the first second and from 40 km/h to 50 km/h the next second. What is the car's acceleration
10km/hxs
suppose you take a trip that covers 150km and takes 5 hours to make. Your average speed is
30km/h
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration?
4.2 m/s/s
the hang time for most athletes is
less than 1 second
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
a ball is thrown upwards and caught when it comes back down. in the absence of air resistance, the speed of the ball the instant before it is caught could be
the same as the speed it had when thrown upwards
consider drops of water leaking from a water faucet. as the drops fall they
get farther apart
When you look at the speedometer in a moving car, you can see the car's
instantaneous speed
When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration
is g; no more, no less
speed is
all of the above
suppose an object is in free fall. each second the object falls
a larger distance than in the seconds before
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/s
a ball is thrown straight up. At the top of its path its acceleration is
about 10 m/s/s
In the absence of air resistance, objects fall at constant
acceleration
one possible unit of speed is
all of the above
a ball is thrown into the air. At the highest point, the ball has zero velocity and zero acceleration
false
a unit of acceleration is meters per second
false
acceleration is defined as the change in
velocity divided by the time interval
as an object falls freely in a vacuum, it's
velocity increases
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