Q: Which of the following is the correct SI unit for force, and what are its base units in terms of mass, length, and time?

$$\text{Newton (N)} = \text{kg} \cdot \text{m} / \text{s}^2$$

Q: Which of the following is the correct unit for the Universal Gravitational Constant $$G in $$Newton's Law of Gravitation $$F = G \frac{m_1$ m_2$}{r^2$}$$?

$$\text{N} \cdot \text{m}^2 / \text{kg}^2$$

Question 1

Which of the following is the correct SI unit for force, and what are its base units in terms of mass, length, and time?

Accepted Answer

$$	ext{Newton (N)} = 	ext{kg} \cdot 	ext{m} / 	ext{s}^2$$

Question 2

A measurement is recorded as $$0.00320 m. $$How many significant figures does this value have?

Accepted Answer

3

Question 3

Express $$0.0000259 in $$scientific notation.

Accepted Answer

$$2.59 	imes 10$$^{-5}$$

Question 4

A wooden cylinder has a radius of $$1.5 cm $$and a height of $$6.0 cm. If $$its mass is $$18 g$$, what is its density in $$	ext{kg/m}^3$$? (Use $$V = \pi r^2$ h$$ and $$1 g$$ $$= 0.001 kg$$, $$1 cm$$ $$= 0.01 m)$$

Accepted Answer

$$424 kg/m$^3$$

Question 5

Which of the following equations is dimensionally consistent for calculating distance $$x (in $$meters) for a box moving with initial speed $$v (in m/s) $$and acceleration $$a (in m/s$^2) $$over time $$t (in s$$)?

Accepted Answer

$$x = v t + \frac{1}{2} a t^2$

Question 6

The speed of light is approximately $$3.00 	imes 10^8$ m/s. Convert this speed to yards per second (yd/s). (1 m = 1.094 yd)

Accepted Answer

$$3.28 	imes 10^8$ yd/s

Question 7

How many gallons are in 1 cubic meter ($$1 m$^3$$)? (1 m$$^3 = 1000 L$$, 1 gal = 3.79 L)

Accepted Answer

$$264$$ gal

Question 8

A cube of iron 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 one side of the cube?

Accepted Answer

$$0.050 m$$

Question 9

Which of the following is the correct scientific notation for $$290,000,000 m$$?

Accepted Answer

$$2.9 	imes 10^8$ m

Question 10

What is the combined volume of two blocks, Block A with side lengths $$0.50 m$$, $$0.075 m$$, $$2.50 m$$, and Block B with a volume of $$2.0 m$^3$$, expressed with the correct number of significant figures?

Accepted Answer

$$2.1 m$^3$$

Question 11

Which of the following is the correct unit for the Universal Gravitational Constant $$G in $$Newton's Law of Gravitation $$F = G \frac{m_1$ m_2$}{r^2$}$$?

Accepted Answer

$$	ext{N} \cdot 	ext{m}^2 / 	ext{kg}^2$$

Question 12

If you convert $$853 ft to $$kilometers, which value is correct? (1 ft = 0.3048 m, 1 km = 1000 m)

Accepted Answer

$$0.260 km$$

Question 13

Which of the following best describes why equations in physics must be dimensionally consistent?

Accepted Answer

So that the units on both sides of the equation match, ensuring the equation is physically meaningful.

Question 14

Express $$5.49 	imes 10^7$ in standard form.

Accepted Answer

$$54,900,000$$

Question 15

Which of the following is the correct way to convert $$22$$ lbs to kilograms? (1 lb = 0.454 kg)

Accepted Answer

$$22 	imes 0.454$$

Question 16

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

Accepted Answer

11

Question 17

A sidewalk is $$2.210 m $$wide and $$90 m $$long. What is its area, expressed with the correct number of significant figures?

Accepted Answer

$$199$$ $$m^2$

Question 18

Which of the following is the correct scientific notation for $$0.0016 kg$$?

Accepted Answer

$$1.6 	imes 10$$^{-3}$$ kg

Kiran's Course

Study Guide - Practice Questions

Study Guide - Flashcards