You are heating two chunks of metal of the same size and shape. One is made of lead and is heated to 400 K. The other is made of iron and is also heated to 400 K. Which of the following statements apply to the thermal radiation the two chunks emit?
A) The two spectra peak at the same wavelength.
B) The spectra cannot be compared because they come from different materials.
C) The lead spectrum peak is at a shorter wavelength than the iron spectrum peak.
D) The lead spectrum peak is at a longer wavelength than the iron spectrum peak.
A) The two spectra peak at the same wavelength.
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A Carnot engine is operated as a refrigerator, taking in 18. J of heat every second and expelling 20. J into a 23.°C room. What is the temperature inside the refrigerator?
A) 300. K B) 15°C C) -15°C D) -6.6°C E) 3.0°C
A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.4 m/s2 . What is the magnitude of the cart's displacement during the first 5.0 s of its motion?
a. 35 m b. 85 m c. 55 m d. 11 m e. 17 m
Entropy: A container of ideal gas at STP undergoes an isothermal expansion and its entropy changes by 3.7 J/K. How much work does it do?
A. 0.0 J B. 1.0 × 103 J C. -1.0 × 103 J D. 1.4 × 103 J E. -1.4 × 103 J
A cannonball has more kinetic energy than the recoiling cannon from which it is fired because the force on the ball
A) is more concentrated. B) meets less resistance than the cannon on the ground. C) acts over a longer distance.