An underwater scuba diver sees the Sun at an apparent angle of 45.0° from the vertical. How far is the sun above the horizon? (nwater = 1.333)
a. 19.5°
c. 48.2°
b. 68.0°
d. 41.8°
A
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If a charged particle is moving through a magnetic field with its velocity at an angle of 45 degrees with respect to the field, what happens to the magnetic force on it if both the speed and magnetic field are doubled?
A. It stays the same. B. It doubles. C. It quadruples. D. It halves. E. It increases by a factor of 5.66.
While all planet orbits are ellipses, the orbits of the eight large planets are relatively ________
Fill in the blank(s) with correct word
How much heat would be required to melt 1.0 kg of LEAD, initially at room temperature? Assume room temperature to be 20°C
(c = 920 J/kg-C° Lf = 0.25 × 105 J/kg LV = 8.67 × 105 J/kg melts at 328.°C boils at 1744.°C)
A superconducting wire's chief characteristic is which of the following?
a. an extremely great length b. a large cross sectional area c. an extremely high temperature d. no resistance