A Thermos bottle has double glass walls with silver coating on the glass surfaces that face each other. The silver coating reduces energy transfer by
A) conduction.
B) convection.
C) radiation.
D) all the above
E) none of the above
Answer: C
You might also like to view...
You and your friend both solve a problem involving a skier going down a slope, starting from rest. The two of you have chosen different levels for y = 0 in this problem. Which of the following quantities will you and your friend agree on?
A) skier's PE B) skier's change in PE C) skier's final KE a) only B b) only C c) A, B, and C d) only A and C e) only B and C
You are looking for a new electrical appliance that will last a long time. You are considering buying a high-efficiency model that uses an average of 60 W
of power and costs $800 or a lower efficiency model that uses an average of 90 W and costs $600 . If the cost of electricity is $0.10/kWh and the appliances are operated continuously, how much money will you have saved by purchasing and operating the high efficiency model over the low efficiency model after 15 years?
In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about the Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. the Earth was at the center of the universe. e. None of the above was believed.
A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity ?. While it rotates, the point(s) at lowest potential is(are)
a.
A.
b.
B.
c.
C.
d.
D.
e.
A and E.