Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would the result be?
a. It would be that of copper since copper is on the outside.
b. It would be that of zinc since zinc is in the center.
c. It would be the sum of the copper and zinc specific heats.
d. It would be between that of copper and that of zinc, depending on coating thickness.
d
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What is not true about the interstellar gas?
A: it's what all stars and planets are made of B: it has very few atoms in each small volume C: it's primarily Helium D: it's an important component in a whole galaxy E: it contains information about the evolution of a galaxy
Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Velma observes the pebble's velocity to be
A) 10 m/s south. B) 10 m/s north. C) 40 m/s south. D) 70 m/s south. E) 70 m/s north.
What potential difference is required across an 8.0-? resistor to cause 2.0 A to flow through it?
What will be an ideal response?
The circuit below contains three 100-W light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
B and C
e.
All three are equally bright.