Question 1

Which of the following is the correct SI unit for force?

Accepted Answer

Newton

Question 2

A student measures the mass of a box. According to the rules of physical quantities, what two components must every measurement have?

Accepted Answer

A number and a unit

Question 3

Express 6.5 hm (hectometers) in meters using the correct metric prefix conversion.

Accepted Answer

$6.5 	imes 10^2$ m

Question 4

Astronomers detect radio waves with wavelengths of $3,000,000,000$ nm. What is this wavelength expressed in decameters (dam)?

Accepted Answer

$0.03$ dam

Question 5

Rewrite $299,800,000$ m/s in scientific notation.

Accepted Answer

$2.998 	imes 10^8$ m/s

Question 6

Convert $22$ lbs to kilograms using the appropriate conversion factor.

Accepted Answer

$9.98$ kg

Question 7

The speed of light is approximately $3.00 	imes 10^8$ m/s. Convert this speed to yards/week (yd/wk).

Accepted Answer

$1.84 	imes 10^{12}$ yd/wk

Question 8

Density is defined as:

Accepted Answer

Mass divided by volume

Question 9

A sphere has a radius of $3960$ mi. If the average density of Earth is $5500$ kg/m$^3$, what is the mass of Earth? (1 mi = 1609 m)

Accepted Answer

$5.97 	imes 10^{24}$ kg

Question 10

An iron cube has a mass of $0.515$ kg. The density of iron is $7.87 	imes 10^3$ kg/m$^3$. What is the length of the sides of the cube?

Accepted Answer

$0.050$ m

Question 11

Which of the following equations is dimensionally consistent for calculating distance $d$ when walking at a constant speed $v$ for time $t$?

Accepted Answer

$d = v 	imes t$

Question 12

Newton's Law of Gravitation is $F = G \frac{m_1 m_2}{r^2}$. If $F$ is in Newtons, $m_1$ and $m_2$ in kg, and $r$ in m, what are the units of the Universal Constant $G$?

Accepted Answer

$\frac{m^3}{kg \ s^2}$

Question 13

How many significant figures are in the number $0.013200972000$?

Accepted Answer

9

Question 14

Which of the following numbers has the greatest precision?

Accepted Answer

10.27 kg

Question 15

Convert $100$ ft$^2$ to m$^2$ using the correct conversion factor.

Accepted Answer

$9.29$ m$^2$

Question 16

If you shift from a smaller to a bigger metric unit, what happens to the number?

Accepted Answer

The number becomes smaller

Question 17

Which of the following is the correct scientific notation for $0.000341$?

Accepted Answer

$3.41 	imes 10^{-4}$

Question 18

When converting units with exponents, how many times should you multiply conversion factors?

Accepted Answer

As many times as the value of the exponent

Question 19

Which of the following is NOT a compatible group of SI units for the equation $F = m 	imes a$?

Accepted Answer

Pound, foot, second

Fundamental Concepts in Physics: Measurement, Units, and Dimensional Analysis

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