A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 31 N
b. 36 N
c. 41 N
d. 46 N
e. 23 N
C
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Which best represents 5,362,000,000 kilometers in scientific notation?
a. 5.4 x 10^9 m b. 5 x 10^10 km c. 53.6 x 10^6 km d. 5.362 x 10^9 mi e. 5.362 x 10^9 km
Two slits separated by 0.10 mm are illuminated with green light (l = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away
a. 2.3 b. 2.5 c. 2.7 d. 2.1 e. 2.0
Newton's rings will be closer together if illuminated with
A) red light. B) blue light. C) white light. D) none of the above
Calculate the temperature drop from the center line to the surface for a 2.5 cm diameter rod having a thermal conductivity of 26 W/(m K) if the rate of heat removal from its surface is 1.6 MW/ m2 .
In a cylindrical fuel rod of a nuclear reactor, heat is generated internally according to the
equation
GIVEN
• A cylindrical rod with internal generation and heat removal from its surface
• Outside diameter (Do) = 2.5 cm=0.025 m
• Rate of heat generation is as given above
• Thermal conductivity (k) = 26 W/(m K)
• Heat removal rate (q/A) = 1.6 MW/m2
FIND
• The temperature drop from the center line to the surface (?T)
ASSUMPTIONS
• The heat flow has reached steady state
• The thermal conductivity of the fuel rod is constant
• One dimensional conduction in the radial direction
SKETCH
