Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer.
b. Beryl, because low thermal conductivity results in high heat transfer.
c. Sapphire, because low thermal conductivity results in low heat transfer.
d. Sapphire, because low thermal conductivity results in high heat transfer.
e. Neither, because low heat transfer is desirable both in summer and in winter.
e
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A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?
A) 20 cm behind the mirror B) 25 cm behind the mirror C) 100 cm in front of the mirror D) 25 cm in front of the mirror E) 20 cm in front of the mirror
At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration of -0.40 rad/s2 has an angular velocity of 1.5 rad/s and an angular position of 2.3 rad. What is the angular position of the wheel at t = 2.0 s?
a. 4.9 rad b. 4.7 rad c. 4.5 rad d. 4.3 rad e. 4.1 rad
Einstein's equation E = mc2 states that when a particle loses energy, the result is an increase in mass of the particle
a. True b. False Indicate whether the statement is true or false
The tank in Problem 1 has a small hole positioned in its top at the very rear of the tank which is accelerated at ax = 5 m/s2 in the direction of the longer side. The lowest pressure in the tank, which is filled with water, is nearest:
(A) 12 kPa (B) 9 kPa (C) ?9 kPa (D) ?18 kPa