Physics Chapter 1 and 2 Test

Gwen releases a rock at rest from the top of a 39-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground?

28 m/s

Assume when using a meter stick measuring can be done so that the last significant figure is the millimeter digit. If you are measuring an object with length between 25 and 26 cm, how many significant figures will result?

3

A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 9.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s

3.09 m/s2

A rock is thrown straight up with an initial velocity of 24.9 m/s. What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s2.)

31.6 m

The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 91.50 in2. The number of significant figures in the width measurement must be at least:

4

A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s2.)

49 m

What is the mass of 5.2 L of water?

5.2 kg

What is the volume of 50 cm3 of water?

50mL

What is the mass of 75 cm3 of water?

75 g

A train slowly climbs a 450-m mountain track which is at an angle of 10.0° with respect to the horizontal. How much altitude does it gain?

78.1 m

Doubling the radius of a sphere results in increasing its volume by a factor of

8

A vehicle designed to operate on a drag strip accelerates from zero to 28 m/s while undergoing a straight line path displacement of 48 m. What is the vehicle's acceleration if its value may be assumed to be constant? ​

8 m/s2

Which one of the choices below represents the preferred practice regarding significant figures when adding the following: ?

85

A cart is given an initial velocity of 7.0 m/s and experiences a constant acceleration of 2.5 m/s2. What is the magnitude of the cart's displacement during the first 6.0 s of its motion?

87m

____________ can be represented by a number and units. The units are always a distance unit squared.

Area

Note the expression: y = x2. Which statement is most consistent with this expression?

If x doubles, then y quadruples

Areas have dimensions ____ while volumes have dimensions ____.

L2, L3

A quantity of 15 m/s2 is a measure of

acceleration

In the absence of air resistance

all objects fall and accelerate at the same rate

Acceleration occurs when an object

changes speed and/or direction.

Since 1967 the standard definition for the second has been based on which of the following?

characteristic frequency of the cesium-133 atom

When you throw a ball directly upward, it is undergoing acceleration

during the entire flight

In the absence of air resistance, an object freely falling near the Earth's surface will have a velocity that is

increasing

The standard metric unit for mass is the ___________.

kilogram

In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two?

length and time

A quantity of 15 m/s is a measure of

speed

Since 1983 the standard meter has been defined in terms of which of the following?

the distance light travels in a certain fraction of a second

A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 5.85 s. What was the height from which the ball was dropped? (g = 9.8 m/s2 and assume air resistance is negligible)

1.68 × 102 m

How many meters are in a kilometer?

1000

The prefix "kilo" means

1000

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s. What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s.)

17.4 m/s

An automobile driver puts on the brakes and decelerates from 35.0 m/s to zero in 11.0 s. What distance does the car travel?

193 m

How many significant figures does the number 1700 have?

2

Multiplying a 2 significant figure number by a 4 significant figure number and then dividing the product by a seven significant figure number yields a number with how many significant figures?

2

A bird, accelerating from rest at a constant rate, experiences a displacement of 26 m in 12 s. What is the average velocity?

2.2 m/s

Displacement is which of the following types of quantities?

vector

A quantity of 15 m/s East is a measure of

velocity

A change in a physical quantity w having initial value wi and final value wf is given by which of the following?

wf − wi

How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order of magnitude.

a century

Acceleration is

a vector quantity