Q: If a person has a mass of $$70.0 \ \mathrm{kg}$$ and is made entirely of protons ($$m_p = 1.67 \times 10$$^{-27}$$ \ \mathrm{kg}$$), how many protons does this person contain?

$$4.19 \times 10$$^{28}$$ protons

Question 1

What is the approximate average distance between the Earth and the Moon?

Accepted Answer

$$380,000 \ \mathrm{km}$$

Question 2

How many seconds are there in one year? (Assume a non-leap year)

Accepted Answer

$$31,557,600 \ \mathrm{s}$$

Question 3

If a person has a mass of $$70.0 \ \mathrm{kg}$$ and is made entirely of protons ($$m_p = 1.67 	imes 10$$^{-27}$$ \ \mathrm{kg}$$), how many protons does this person contain?

Accepted Answer

$$4.19 	imes 10$$^{28}$$ protons

Question 4

Given $$T = 2\pi \sqrt{\frac{m}{k}}$$, where $$m$$ has units of mass and $$k$$ has units of mass divided by time squared, what are the units of $$T$$?

Accepted Answer

$$\mathrm{s}$$

Question 5

Jarmilla walks to the bodega and back, ending at her starting point. Which statement is true about her entire trip?

Accepted Answer

Her average velocity and her displacement are zero.

Question 6

Which of the following scenarios describes a trip with zero average velocity?

Accepted Answer

A dog fetches a stick and returns it to her human.

Question 7

A graph of $$x vs$$. $$t$$ shows a straight line with a positive slope. Which statement best describes the motion?

Accepted Answer

The object has positive velocity.

Question 8

Which of the following is the correct way to express $$0.000345 in $$scientific notation?

Accepted Answer

$$3.45 	imes 10$$^{-4}$$

Question 9

A runner completes a $$400 \ \mathrm{m}$$ lap around a track in $$50 \ \mathrm{s}$$, ending where she started. What is her average velocity?

Accepted Answer

$$0 \ \mathrm{m/s}$$

Question 10

Which of the following is NOT a base SI unit?

Accepted Answer

$$\mathrm{liter}$$

Question 11

A car travels $$120 \ \mathrm{km} in$$ $$2.0 \ \mathrm{h}$$, then $$60 \ \mathrm{km} in$$ $$1.0 \ \mathrm{h} in $$the opposite direction. What is the average speed for the entire trip?

Accepted Answer

$$60 \ \mathrm{km/h}$$

Question 12

Which of the following quantities is a vector?

Accepted Answer

Displacement

Question 13

If $$1 \ \mathrm{mile} = 1.609 \ \mathrm{km}$$, how many kilometers are in $$5.0 \ \mathrm{miles}$$?

Accepted Answer

$$8.045 \ \mathrm{km}$$

Question 14

Which of the following best describes the purpose of dimensional analysis in physics?

Accepted Answer

To check the consistency of equations and convert units

Question 15

A cyclist rides $$2.0 \ \mathrm{km}$$ east, then $$2.0 \ \mathrm{km}$$ west, taking $$30 \ \mathrm{min} in $$total. What is the magnitude of the cyclist's average velocity?

Accepted Answer

$$0 \ \mathrm{km/h}$$

Question 16

Which of the following is the correct number of significant figures in the measurement $$0.00450$$?

Accepted Answer

3

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