Chapter 3

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

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


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