An electron is accelerated from rest through a potential difference of 50.0 kV. What is the speed of the electron? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 1.24 × 108 m/s
B) 1.33 × 108 m/s
C) 3.24 × 108 m/s
D) 3.33 × 108 m/s
E) 4.12 × 108 m/s
A
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A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is 115 W/(m2 °C), estimate the temperature of the shell after reentry, assuming the time of reentry is 10 min and the interior of the shell is evacuated.
GIVEN
• A spherical stainless steel satellite reentering the atmosphere
• Outside diameter (D) = 3 m
• Wall thickness (L) = 1.25 cm = 0.0125 m
• Its original temperature (To) = 38°C
• The effective temperature of the atmosphere (T?) = 1093°C
• The effective heat transfer coefficient ch = 115 W/(m2 °C)
• The time of reentry (tr) = 10 min = 600 s
• The interior of the shell is evacuated
FIND
• The temperature of the shell after reentry (Tf)
ASSUMPTIONS
• Exterior heat transfer is uniform over the shell
• Assume radiation heat transfer is allowed for in the heat transfer coefficient
SKETCH
Each second, the burning Sun's mass
A) decreases. B) increases. C) remains unchanged.
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum velocity in the upward direction?
A. 20.0 m/s B. 25.0 m/s C. 30.0 m/s D. 35.0 m/s E. 40.0 m/s
Most of the larger moons of gas giants were formed at the same time as the gas giants, but somewhere else in the Solar System, and captured by the gas giants later.
Answer the following statement true (T) or false (F)