Two identical blocks of iron are placed in contact, one at 10°C and the other at 20°C. If the cooler block cools to 5°C and the warmer block warms to 25°C, this would violate the
A) first law of thermodynamics.
B) second law of thermodynamics.
C) third law of thermodynamics.
D) none of the above
Answer: B
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A circuit contains two inductors of 6.0-mH inductance in parallel placed in series with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
A. 3.0 mH B. 3.4 mH C. 4.8 mH D. 11 mH E. 20 mH
What was Tycho Brahe's contribution to astronomy? a. He proved that Earth rotates on its own axis and revolves around the Sun
b. He designed the three laws of planetary motion. c. He discovered satellites around Jupiter, which proved Earth could move and keep its satellite. d. He described why each of the planets moved in uniform circular motion. e. He compiled detailed observations of the positions of the Sun, Moon, and planets over a period of 20 years.
An object has gravitational potential energy due to its
A) speed. B) acceleration. C) momentum. D) location. E) none of the above
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?
a.
7.0 kN up
b.
7.0 kN down
c.
2.8 kN down
d.
2.8 kN up
e.
5.6 kN down