Low levels of ionizing radiation
a. are dangerous to the human body
b. can be tolerated by the human body
c. are beneficial to the human body
d. none of the above
B
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Stars that have masses similar to the Sun's, and sizes similar to the Earth are
A) main sequence stars. B) white dwarfs. C) red giants. D) red dwarfs. E) brown dwarfs.
A 2.5 cm sphere is maintained at 50°C in either an air stream or a water stream, both at 20°C and 2 m/s velocity. Compare the rate of heat transfer and the drag on the sphere for both fluids.
GIVEN
• A sphere in an air stream or a water stream
• Sphere diameter (D) = 2.5 cm = 0.025 m
• Sphere temperature (Ts) = 50°C
• Fluid temperature (Tf) = 20°C
• Fluid velocity (U?) = 2 m/s FIND
• The rate of heat transfer (q) and the drag force
ASSUMPTIONS
• Radiation is negligible
SKETCH
PROPERTIES AND CONSTANTS
A proton moves through a magnetic field of magnitude 1.40 T with speed 5.00 ´ 106 m/s. What is the magnitude of the maximum acceleration of the proton? The mass of a proton is 1.67 ´ 10–27 kg, and its charge is 1.6 ´ 10–19 C.
a. 3.42E+14 m/s
b. 6.71E+14 m/s
c. 3.35E+21 m/s
d. 1.71E+21 m/s
Energy resulting from motion is called ______________
Fill in the blank(s) with correct word