Chapter 3
A water drops fall at a steady rate from a leaking faucet they
get farther apart
if an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be
greater then the second before
the distance a ferruling falling bowling ball falls each second
increases
the speedometer of an automobile reads
instantaneous speed
a vehicle undergoes acceleration when it
losses speed; gains speed, changes in direction
12 seconds after staring from rest, a freely falling cantaloupe has a speed of
more than 100m/s
which is not a vector quantity a.all are vector quantities b. non are vector quantities c.acceleration d.speed
speed
while an iron block near the earths surface is in free fall, it undergoes an increase in
speed
a balll is thrown upwards and caught when it comes back down. In the absence of air resistence, the speed of the ball when caught would be
the asme as the speed it has when thrown upwards
acceleration is defined as
the rate at which velocity itself changes
a ball is thrown upwards and returns to the same location. Compared with its intial speed its speed when it returns is about
the same
a rock dropped from a 5m height accelerates at 10m/s2 and strikes the ground 1s later. If the rock is dropped form a high of 2.5 m, its acceleration of fall is
the same
A mosquito flying at 3m/s that encounters a breeze blowing at 3m/s in the opposite direction has a speed of
0m/s
a ball is thrown straight up. At the top of its path its instantaneous speed is
0m/s
a bird flying at 8km/s crosswind has a resultant speed of
10km/h
when you walk at an average speed of 4m/s, 5m/s you'll cover a distance of
20m
ten seconds after starting from rest, a car is moving at 40m/s. What is the car's acceleration?
4.0m/s
if a car increase its velocity from zero to 60m/s in 10 second, its acceleration is
6m/s2
when you look t the speedometer in a moving car, you can see your cars
instantaneous speed
jogging Jake runs at 4m/s along a train flatcar that moves at 10m/s int eh same direction. Jakes's speed relative to the ground is
14 m/s
an airplane that flies at 100km/s crosswind has a ground speed of
141 km/h
If a stone falls to the bottom of a mineshaft in 6 seconds. then the depth of the shaft is about
180m
a cart changes its peed from 90m/s to 100m/s in 10 seconds. During this interval its acceleration is
1m/s
The time it takes a projectile fired straight up at 10m's to reach the top of its path is about
1s
An object falls freely from rest on a a plant where the acceleration due to gravity is 20m/s. After 5 seconds, the object will have a speed of
20 x 5 =100 m/s
a ball starting from rest at the top of an inclined plane gains a speed of 2ms for each second it rolls. What is its acceleration down the incline?
2m/s
neglecting air resistance, how fast must you toss a ball straight up in order for it to take 6 second to return to its initial level?
30m/s
A car starts from rest and after 10 second s it is moving at 40 m/s. What is the cars average acceleration?
4m/s 2
an 8- km/h airplane caught in a 60km/s crosswind has a resilient speed of
100km/s
when a ball thrown straight upwards reaches the very top of its path, its accelration is
10m/s
if freely failing obj were equipped with a speedometer, its speed reading would increase each second by about
10m/s ?
at one instant a heavy obj in the air is moving upward at 50m/s. One second later, it speed is approximately
60 m/s
a cars speed is 3 seconds after accelerating from rest at 2m/s2 is
6m/s
an 80 km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of
90km/h
A ball starting from rest at the top of an inclined plane accerlerates at 2m/s 2 and reaches the bottom of the plane in 3 seconds. What is the length of the plane?
9m
suppose an object is in free fall. Each second the object falls
a larger distance than in the second befreo
a humming bird flying at 4km/h that gets caught in a 3 km/h crosswind has a resultant speed of
about 5km/h
in the absence of air resistance, obj fall at constant
acceleration
the 2 measurements necessary for calculating average speed are
distance and time
acceleration is defined as the change in
velocity divided by the time interval
an object falls freely in a vacuum, it
velocity increase
while a car travels around a circular track at a constant speed, it
velocity is not zero
suppose youa re in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. which of the following is not tru
your velocity is constant
A cart maintains a constant velocity of 100m/s for 10 sec. During this interval its acceleration is
zero
