A perpetual motion machine of the second kind
A. violates the first law of thermodynamics
B. would be a good investment
C. violates the second law of thermodynamics
D. violates the zeroth law of thermodynamics
C. violates the second law of thermodynamics
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An unusual spring has a restoring force of magnitude F = (2.0 N/m) x + (1.0 N/m2)x2, where x is the stretch of the spring from its equilibrium length
A 3.00 kg mass is attached to this spring and released from rest after stretching the spring 2.00 m. What is the speed of the mass when the spring returns to its equilibrium length? A) 3.27 m/s B) 5.48 m/s C) 4.33 m/s D) 7.41 m/s E) 2.11 m/s
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95% b. 60% c. 80% d. 64% e. 75%
A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
A. 0.15 N B. 0.68 N C. 0.30 N D. 0.34 N E. 0.10 N
Methane drives the weather of Titan, for there it can be liquid, solid, or gas
Indicate whether the statement is true or false