Physics Please

Ace your homework & exams now with Quizwiz!

If a freely falling object were somehow equipped with a speedometer, its speeding reading would increase each second by about

10 m/s

Neglecting air resistance, a bullet fired straight down from the top of a high cliff has an acceleration of

10 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. Relative to the Earth, the boat travels

141 m

A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank

100 m farther south

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

A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is

100-90=10m/s2 and 10/10= 1m/s2

A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of

about 14 km/h

Which of the following is not a vector quantity?

all are vector quantities

Compared with the hang time on the Earth, the hang time on the moon would be

greater

The distance a freely falling bowling ball falls each second

increases

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

A mosquito flying at 3m/s that encounters a breeze blowing at 3m/s the opposite way, what is its speed

0 m/s

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^2

The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is about

1 s

A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline?

2 m/s^2

The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about

2 s

At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately

40 m/s

A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about

5 km/h

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 mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of

6 m/s

At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is

60 m/s

Jogging jake runs at 4m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is

6m/s (subtract)

A ball starting from rest at the top of an inclined plane accelerates at 2 m/s^2 and reaches the bottom of the plane in 3 seconds. What is the length of the plane?

9 m

If an object moves with constant acceleration, its velocity must

change by the same amount each second

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


Related study sets

16 Types of Identification Methods

View Set

How to Cook Rice, Grains, and Beans

View Set

Explorers (john cabot, robert de la salle, samuel de champlain, & francisco coronado)

View Set

Tab Settings and Paragraph Formatting

View Set