Q: A projectile is launched at an angle $$\theta$$ with initial speed $$v_0. $$What is the maximum height $$H it $$reaches?

$$H = \frac{v_0$^2 \sin^2$ \theta}{2g}$$

Q: A 2 kg object is dropped from a height of 5 m. Ignoring air resistance, what is its velocity just before hitting the ground?

$$v = \sqrt{2 \times 9.8 \times 5}$$

Q: A 10 $$\Omega$$ resistor is connected to a 5 V battery. What is the current through the resistor?

$$I = \frac{5}{10} = 0.5 \text{ A}$$

Q: A wave has a frequency of 60 Hz and a wavelength of 2 m. What is its speed?

$$v = f \lambda = 60 \times 2 = 120 \text{ m/s}$$

Q: A 0.5 kg ball is thrown vertically upward with a speed of 8 m/s. What is its maximum height?

$$h = \frac{v^2$}{2g} = \frac{8^2$}{2 \times 9.8}$$

Question 1

A car of mass $$m is $$moving at velocity $$v$$ and comes to a stop due to friction over a distance $$d. $$Which equation best describes the work done by friction?

Accepted Answer

$$W = -\frac{1}{2} m v^2$

Question 2

A projectile is launched at an angle $$	heta$$ with initial speed $$v_0. $$What is the maximum height $$H it $$reaches?

Accepted Answer

$$H = \frac{v_0$^2 \sin^2$ 	heta}{2g}$$

Question 3

Which of the following best describes Newton's Second Law of Motion?

Accepted Answer

$$F = m a$$

Question 4

A block slides down a frictionless incline of height $$h. $$What is its speed at the bottom?

Accepted Answer

$$v = \sqrt{2 g h}$$

Question 5

A satellite orbits Earth in a circular path of radius $$r. $$What is the expression for its orbital speed $$v$$?

Accepted Answer

$$v = \sqrt{\frac{G M}{r}}$$

Question 6

Which law explains why a boat moves backward when a person jumps forward off it?

Accepted Answer

Newton's Third Law

Question 7

A 2 kg object is dropped from a height of 5 m. Ignoring air resistance, what is its velocity just before hitting the ground?

Accepted Answer

$$v = \sqrt{2 	imes 9.8 	imes 5}$$

Question 8

Which of the following is the correct formula for the period $$T of a $$simple pendulum of length $$L$$?

Accepted Answer

$$T = 2 \pi \sqrt{\frac{L}{g}}$$

Question 9

A heat engine absorbs 500 J of heat and does 200 J of work. What is its efficiency?

Accepted Answer

$$\eta = \frac{200}{500} = 0.4$$

Question 10

Which of the following best describes the relationship between electric current $$I$$, voltage $$V$$, and resistance $$R in $$Ohm's Law?

Accepted Answer

$$V = I R$$

Question 11

A 10 $$\Omega$$ resistor is connected to a 5 V battery. What is the current through the resistor?

Accepted Answer

$$I = \frac{5}{10} = 0.5 	ext{ A}$$

Question 12

A wave has a frequency of 60 Hz and a wavelength of 2 m. What is its speed?

Accepted Answer

$$v = f \lambda = 60 	imes 2 = 120 	ext{ m/s}$$

Question 13

Which of the following is the correct expression for the gravitational force between two masses $$m_1$$ and $$m_2$$ separated by distance $$r$$?

Accepted Answer

$$F = G \frac{m_1$ m_2$}{r^2$}$$

Question 14

A 0.5 kg ball is thrown vertically upward with a speed of 8 m/s. What is its maximum height?

Accepted Answer

$$h = \frac{v^2$}{2g} = \frac{8^2$}{2 	imes 9.8}$$

Question 15

Which of the following statements about electromagnetic induction is correct?

Accepted Answer

A changing magnetic field induces an electric current in a conductor.

Question 16

A gas undergoes an isothermal expansion at temperature $$T. $$Which equation describes the work done by the gas?

Accepted Answer

$$W = n R T \ln \left( \frac{V_f}{V_i} \right)$$

Question 17

A circuit contains a 12 V battery and two resistors, 4 $$\Omega$$ and 8 $$\Omega$$, in series. What is the total current?

Accepted Answer

$$I = \frac{12}{4 + 8} = 1 	ext{ A}$$

Question 18

A sound wave travels through air at 340 m/s. If its frequency is 1700 Hz, what is its wavelength?

Accepted Answer

$$\lambda = \frac{v}{f} = \frac{340}{1700} = 0.2 	ext{ m}$$

Question 19

Which of the following best describes the principle of conservation of momentum in a collision?

Accepted Answer

The total momentum before the collision equals the total momentum after the collision.

Physics I: Course and Laboratory Syllabus Overview

Guida di studio - Domande di pratica

Study guide - Flashcard