A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K
a. 0.0001 times
b. 0.1 times
c. the same as
d. 10 times
e. 10,000 times
B
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Impulse: A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 × 10-26 kg, and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many atoms strike the umbrella each second? Assume that the wind blows horizontally so that the gravity can be neglected.
What will be an ideal response?
A 40.0-g block of ice at -15.00°C is dropped into a calorimeter (of negligible heat capacity) containing water at 15.00°C
When equilibrium is reached, the final temperature is 8.00°C. How much water did the calorimeter contain initially? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg. A) 546 g B) 405 g C) 345 g D) 302 g E) 634 g
The pair of water-filled caissons of the Falkirk Wheel have equal weights whenever
A) they carry equal-weight floating boats. B) one carries a heavy floating boat and the other only water. C) they carry unequal weights of floating boats. D) all of the above E) none of the above
At t = 0 the switch S is closed with the capacitor uncharged. If C = 40 ?F, ? = 50 V, and R = 5.0 k?, how much energy is stored by the capacitor when I = 2.0 mA?
a.
20 mJ
b.
28 mJ
c.
32 mJ
d.
36 mJ
e.
40 mJ