Q: A ball is thrown straight up with an initial velocity of $$10\ \mathrm{m/s}. $$What is its velocity after 1 second? (Assume $$g = 9.8\ \mathrm{m/s^2$}$$ downward)

$$v = 10 - 9.8 \times 1 = 0.2\ \mathrm{m/s}$$

Q: A person pushes a box with a force of $$100\ \mathrm{N}$$ for $$5\ \mathrm{m}. $$How much work is done?

$$W = 100 \times 5 = 500\ \mathrm{J}$$

Question 1

A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is its average acceleration?

Accepted Answer

$$a = \frac{20}{5} = 4\ \mathrm{m/s^2$}$$

Question 2

Which of the following best describes the difference between a vector and a scalar?

Accepted Answer

A vector has both magnitude and direction, while a scalar has only magnitude.

Question 3

A ball is thrown straight up with an initial velocity of $$10\ \mathrm{m/s}. $$What is its velocity after 1 second? (Assume $$g = 9.8\ \mathrm{m/s^2$}$$ downward)

Accepted Answer

$$v = 10 - 9.8 	imes 1 = 0.2\ \mathrm{m/s}$$

Question 4

Which of Newton's Laws explains why passengers move forward when a car suddenly stops?

Accepted Answer

Newton's First Law of Motion

Question 5

A box is pulled across a floor with a force of $$50\ \mathrm{N}$$, but friction opposes the motion with $$30\ \mathrm{N}. $$What is the net force?

Accepted Answer

$$F_{net} = 50 - 30 = 20\ \mathrm{N}$$

Question 6

Which of the following is an example of work being done?

Accepted Answer

Lifting a book from the floor to a shelf

Question 7

A satellite orbits Earth in a circular path. Which force keeps it in orbit?

Accepted Answer

Gravitational force

Question 8

Which equation correctly expresses the conservation of momentum in a collision?

Accepted Answer

$$m_1$$ $$v_1$$ + $$m_2$$ $$v_2$$ = $$m_1$$ $$v_1$$' + $$m_2$$ $$v_2$$'$$

Question 9

A diver jumps off a boat into the ocean. Which principle explains why the diver floats more easily in salt water than in fresh water?

Accepted Answer

Buoyant force (Archimedes' principle)

Question 10

Which of the following best describes the energy transformation in a hydroelectric dam?

Accepted Answer

Potential energy to kinetic energy to electrical energy

Question 11

A ball moving in a circle of radius $$r at $$constant speed $$v$$ has which expression for its centripetal acceleration?

Accepted Answer

$$a_c = \frac{v^2$}{r}$$

Question 12

Which of the following is NOT a property of sound waves?

Accepted Answer

Sound waves can travel through a vacuum.

Question 13

A sealed container is taken from sea level to the top of a mountain. What happens to the pressure inside the container?

Accepted Answer

It remains the same.

Question 14

Which equation gives the pressure at a depth $$h in a $$fluid of density $$\rho$$ under gravity $$g$$?

Accepted Answer

$$P = \rho g h$$

Question 15

A person pushes a box with a force of $$100\ \mathrm{N}$$ for $$5\ \mathrm{m}. $$How much work is done?

Accepted Answer

$$W = 100 	imes 5 = 500\ \mathrm{J}$$

Question 16

Which of the following best describes the Doppler effect?

Accepted Answer

The change in frequency or wavelength of a wave in relation to an observer moving relative to the source

Question 17

Which subatomic particle is responsible for the charge of an atom?

Accepted Answer

Electron

Question 18

A block floats in water but sinks in oil. What does this indicate about the densities of the block, water, and oil?

Accepted Answer

The block's density is less than water but greater than oil.

Question 19

Which of the following is a correct statement of Newton's Second Law?

Accepted Answer

$$F = m a$$

Physics 107 – Final Exam Review: Comprehensive Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드