A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215°C
(? = 5.670 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.90 × 10-3 m ? K, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
(a) Near what wavelength does this sphere radiate most strongly?
(b) If all the radiated energy were at the wavelength found in part (a), how many photons would the sphere emit each second?
(a) 5.94 µm (b) 9.79 × 1021 photons
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A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
a. 17 m b. 21 m c. 18 m d. 27 m e. 31 m
Waves on a String: A piano wire of linear mass density 0.0050 kg/m is under a tension of 1350 N. What is the wave speed in this wire?
A. 130 m/s B. 260 m/s C. 520 m/s D. 1040 m/s
Water undergoes viscous flow through two pipes with the same pressure difference between the ends. Pipe 1 has three times the diameter as pipe 2. Pipe 1 has 2 times the length of pipe 2. If the flow rate through pipe 1 is 0.400 
then what is the flow rate through pipe 2?
A. 
B. 
C. 
D. 
E. 
The difference in the Moon's gravitational force on the near and far sides of the Earth produces a(n) ________
Fill in the blank(s) with correct word