1. Heat flows from the hotter to the colder object.
2. The moisture forms an insulating layer between the hot iron and the skin, so that brief contact is safe. The water
temperature will not go over 100C and evaporatin
REVIEW AND SYNTHESIS: CHAPTERS 912
1. Strategy The magnitude of the buoyant force on an object in water is equal to the weight of the water displaced
by the object.
(a) Lead is much denser than aluminum, so for the same mass, its
ELASTICITY AND OSCILLATIONS
1. Youngs modulus does not tell us which is stronger. Instead, it tells us which is more resistant to deformation for a
given stress. The ultimate strength would tell us which is strongeri.e., wh
REVIEW AND SYNTHESIS: CHAPTERS 15
1. Strategy Replace the quantities with their units.
Solution Find the units of the spring constant k.
F = kx, so k =
kg m s 2
, and the units of k are N m =
= kg s 2 .
2. (a) Strategy Find Harrison
REVIEW AND SYNTHESIS: CHAPTERS 1315
1. Strategy Assume no heat is lost to the air. The potential energy of the water is converted into heating of the
water. The internal energy of the water increases by an amount equal to the initial pote
1. Wrapping a thick coil of copper wire around a piano string increases the strings mass density and therefore
decreases the speed of waves traveling along it. The fundamental wavelength is fixed by the length of the
TEMPERATURE AND THE IDEAL GAS
1. The development of standard temperature scales requires use of the zeroth law of thermodynamics. This law tells
us that if a thermometer is in thermodynamic equilibrium with both a test obje
1. Yes, but it wouldnt be a very good heat pump. Like an electric heater, the heat output would be equal to the work
input, with no heat being taken from the cold reservoir.
2. That one process uses fuel more
1. The wavelength of the standing waves inside a bassoon is determined by the length of its air chamber. With a
fixed fundamental wavelength, the frequency of these waves depends only upon the speed of sound in air, w
REVIEW AND SYNTHESIS: CHAPTERS 68
1. (a) Strategy Multiply the extension per mass by the mass to find the maximum extension required.
1000 g 1 m
= 0.20 m
1 kg 1000 mm
(b) Strategy Set the weight of