A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more than double that of copper
Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium? A) the aluminum
B) the copper
C) neither; both experience the same size gain or loss of heat
D) it is impossible to tell without knowing the masses
E) it is impossible to tell without knowing the volumes
C
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Series/Parallel Circuits: The following three appliances are connected in parallel across an ideal 120-V dc power source: 1200-W toaster, 650-W coffee pot, and 600-W microwave. If all were operated at the same time what total current would they draw from the source?
A. 4.0 A B. 5.0 A C. 10 A D. 20 A
An elevator suspended by a vertical cable is moving downward but slowing down. The force that the cable exerts on the elevator must be
A) greater than the force that Earth exerts on the elevator. B) less than the force that Earth exerts on the elevator. C) equal to the force that Earth exerts on the elevator.
In each of the following situations, point charge q moves in a uniform magnetic field B. The strength of the magnetic field is indicated by the density of field lines. In each situation, the initial speed v of the charge is the same. For which situation(s) will the charge q have the largest displacement in a certain time T?
The type of mirror that will allow you to see large areas normally hidden from your view is
a. concave b. convex c. plane d. half-silvered e. polaroid