Question 1

A transverse wave on a string has a wavelength of $$0.5\ \mathrm{m}$$ and a frequency of $$4\ \mathrm{Hz}. $$What is the speed of the wave?

Accepted Answer

$$2\ \mathrm{m/s}$$

Question 2

Two identical blocks are slowly lowered into the ocean. Which of the following best describes the buoyant force $$F_b$$ acting on each block as a function of time?

Accepted Answer

It increases until the block is fully submerged, then remains constant.

Question 3

Two gases, A and B, are in identical containers at the same temperature, pressure, and volume. If the atomic mass of A is $$20\ \mathrm{g/mol}$$ and B is $$40\ \mathrm{g/mol}$$, what is the ratio of the number of molecules of A to B?

Accepted Answer

1:1

Question 4

A $$200\ \mathrm{g}$$ piece of metal absorbs $$800\ \mathrm{J} of $$energy, causing its temperature to rise by $$10\ ^\circ\mathrm{C}. $$What is the specific heat capacity $$c of $$the metal?

Accepted Answer

$$0.4\ \mathrm{J/(g\cdot ^\circ C)}$$

Question 5

Water flows through a pipe that narrows from a diameter of $$4\ \mathrm{cm} to$$ $$2\ \mathrm{cm}. If $$the speed in the wider section is $$1\ \mathrm{m/s}$$, what is the speed in the narrower section?

Accepted Answer

$$4\ \mathrm{m/s}$$

Question 6

Two gases, X and Y, have atomic masses $$m_X = 16\ \mathrm{u}$$ and $$m_Y = 32\ \mathrm{u}. At $$the same temperature, which statement about their average kinetic energies is correct?

Accepted Answer

Both have the same average kinetic energy.

Question 7

If the mass of a substance is doubled while the amount of heat added and its specific heat remain constant, how does the temperature change compare to the original?

Accepted Answer

The temperature change is halved.

Question 8

In simple harmonic motion, if the amplitude is doubled, what happens to the maximum velocity?

Accepted Answer

It is doubled.

Question 9

The root mean square speed of a gas molecule at temperature $$T is $$given by $$v_{rms} = \sqrt{\frac{3k_BT}{m}}. If $$the temperature is doubled, what happens to $$v_{rms}$$?

Accepted Answer

It increases by a factor of $$\sqrt{2}.$$

Question 10

A ball with density $$\rho_{ball} is $$placed in a liquid with density $$\rho_{liquid}. $$Which statement is correct?

Accepted Answer

If $$\rho_{ball} \u003c \rho_{liquid}$$, the ball floats.

Question 11

What is the period $$T of a $$simple pendulum of length $$L in $$terms of gravitational acceleration $$g$$?

Accepted Answer

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

Question 12

A plot of wave velocity $$v$$ versus string tension $$T is $$shown. Which graph best represents the relationship?

Accepted Answer

A curve showing $$v \propto \sqrt{T}$$

Question 13

An alloy is made from $$100\ \mathrm{g} of $$copper ($$c_{Cu} = 0.39\ \mathrm{J/(g\cdot ^\circ C)}) $$and $$200\ \mathrm{g} of $$aluminum ($$c_{Al} = 0.90\ \mathrm{J/(g\cdot ^\circ C)}). $$How much heat is needed to raise the temperature of the alloy by $$10\ ^\circ\mathrm{C}$$?

Accepted Answer

$$2790\ \mathrm{J}$$

Question 14

A barrel contains $$50\ \mathrm{L} of $$water. If the faucet opening has an area of $$2\ \mathrm{cm}^2$$ and the water level is $$1\ \mathrm{m}$$ above the faucet, what is the speed of water exiting the faucet? (Neglect viscosity)

Accepted Answer

$$4.43\ \mathrm{m/s}$$

Question 15

To determine the temperature rise of a material when a known amount of heat is added, which information is most essential?

Accepted Answer

Mass and specific heat capacity

Question 16

A temperature vs. time graph for heating ice to steam shows flat regions. What do these flat regions represent?

Accepted Answer

Phase changes where temperature remains constant

Question 17

A sample has mass $$m = 100\ \mathrm{g}$$, density $$\rho = 2\ \mathrm{g/cm}^3$$, and molar mass $$M = 50\ \mathrm{g/mol}. $$How many moles are present?

Accepted Answer

$$2\ \mathrm{mol}$$

Physics Exam 3 Study Guide: Waves, Thermodynamics, Fluids, and Kinetic Theory

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