Electric resistance in our skin is lowered when our skin is
A) moist.
B) dry.
C) none of the above
Answer: A
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The Sun is spherical due to
A) Earth circling it. B) Earth and Moon circling it. C) gravitation. D) none of the above
About how long does it take a spacecraft to go from Earth to Jupiter?
a. a week b. a month c. a year d. several years e. several decades
The distance between the ruled lines on a diffraction grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum? A) 3.3° B) 5.3° C) 4.3° D) 6.3° E) 2.3°
A rocket of mass M carries a mass m of fuel and starts from rest
Which method of burning the fuel would result in the greatest final speed of the rocket after all the fuel is burned if the velocity of the exhaust gas relative to the rocket is fixed at uex? A) Burn the exhaust gas at an exponentially increasing rate until it is exhausted. B) Burn the fuel as slow as possible so the force on the rocket acts for the greatest time resulting in the greatest possible impulse to the rocket. C) Burn the fuel slowly until the rocket reaches a speed equal to uex and then burn the remainder as quickly as possible so that the exhaust gas has the minimum kinetic energy. D) Burn the exhaust gas at an exponentially decreasing rate to make it last forever. E) Burn all the fuel in as short a time as possible.