A design requires a material to operate at normal atmospheric temperatures, be subjected to small applied forces, and have a low density and a low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic
(b) Carbon steel
(c) Polyethylene
(d) Graphite-reinforced-epoxy composite
(c) Polyethylene
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Water actually contracts when it is warmed near its freezing point. In this range, is water’s heat capacity at constant volume (A) greater than, (B) less than, or (C) equal to its heat capacity at constant pressure?
(A) greater than (B) less than (C) equal to
Vector is 75.0 cm long and points at 30° above the positive x axis. Vector is 25.0 cm long and points along the negative x axis. Vector is 40.0 cm long and points at 45° below the negative x axis
(a) Determine the x and y components of Vector . (b) Determine the x and y components of Vector . (c) Determine the x and y components of Vector . (d) Determine the sum of these three vectors in terms of components. (e) Determine the sum of these three vectors in terms of magnitude and direction.
Using a 1.5-mF capacitor, a 2.5-mF capacitor, and a 6.0-mF capacitor, which of the following capacitances cannot be made by a combination that uses all three?
a. 10.0 mF b. 0.81 mF c. 6.9 mF d. 0.67 mF e. 3.3 mF
A bat, flying at 3.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)
a. 51.5 kHz c. 40.8 kHz b. 51.2 kHz d. 50.9 kHz