A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton due to this field? (e = 1.60 × 10-19 C)
What will be an ideal response?
9.6 × 10-16 N
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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
Star A and star B have the same temperature, but different luminosities. What can you infer about these two stars?
A) Star A must be bigger. B) Star B must be bigger. C) Star A must be redder. D) Star B must be redder. E) Nothing can be inferred from the information given.
Which of the following types of stars are NOT suitable for advanced life?
A) K-type B) M-type C) G-type D) F-type
Water in a pond is at 2ºC and the air temperature is -20ºC with a convective heat transfer coefficient of 30 W/m^2?K above the water. When the water begins to freeze and the lower convective heat transfer coefficient between the ice and the water is 20 W/m^2?K, estimate the ice thickness after 8 hours.
What will be an ideal response?