physics 101 hw

A centimeter is a.) 100 times larger than a meter b.) 10 times longer than a meter c.) (1 / 10) as long as a meter d.) (1 / 100) as long as a meter

(1 / 100) as long as a meter

A car is moving on a highway with a speed of 60 m/s. 5 seconds later the car is moving at 10 m/s in the same direction. The magnitude of the car's acceleration is a.) -10 m/s2 b.) 0 m/s2 c.) -14 m/s2 d.) +10 m/s2

-10 m/s2

One-inch equals a.) 25.4 centimeters b.) 254 centimeters c.) 2.54 centimeters d.) 0.254 centimeter

0.254 centimeter

A student releases a ball from rest on an inclined plane and measures that it travels a distance of 10.0 m in a time of 4.0 s. The average speed of the ball is

2.5 m/s

A car starts from rest and reaches 20 m/s in 5 seconds. The average acceleration of the car is

4 seconds

Which of these is not important to the development of scientific explanations? a.) Measurement b.) Communication d.) Debate c.) All of these are important

All of these are important

In one dimensional motion, the average speed of an object that moves from one place to another and then back to the original place has which of the following properties?

It can be positive, negative or zero

A negative distance implies that an object is a.) On the negative side of the origin, Above the origin b.) To the right of the origin, Below the origin

On the negative side of the origin, Above the origin

Speed is a.) a scalar quantity b.) a vector quantity

a scalar quantity

The slope of the velocity versus time graph is the

acceleration

Acceleration represents the

change in distance with respect to time

Average speed is calculated by

dividing the distance traveled by the elapsed time

Instantaneous speed is calculated by choosing a short time interval during which the speed is held constant or as nearly constant as is practicable. a.) true b.) false

false

A scientific law a.) is an educated guess b.) represents the majority opinion of scientists in a vote c.) is an educated guess d.) is a generalization based upon experiments or observation

is a generalization based upon experiments or observation

A unit of volume in the metric system is the

liter

The basic unit of length in the metric system is the

meter

Speed is a.) scalar b.) vector

scalar

The term for the application of the basic laws of nature to produce practical devices for mankind is

technology

An essential feature of a scientific theory is a.) complexity b.) the use of mathematics c.) the use of specialized language d.) the making of predictions that can be tested

the making of predictions that can be tested

In the case of uniform accelerated motion, the graph of velocity versus time is a straight line. true or false

true

Velocity is: a.) vector b.) scalar

vector

The slope of the distance traveled versus time graph is the: a.) acceleration b.) velocity

velocity