A road bicycle racer rides down the highway from Pike’s peak. During one stretch of the ride, he descends 150 m while accelerating from 35 km/hr to some final speed. Assuming rolling friction and air resistance to be negligible, what is that final speed?
A. 113 km/h
B. 118 km/h
C. 148 km/h
D. 169 km/h
B. 118 km/h
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Bragg reflection results in a first-order maximum at 12.2°. In this case, at what angle would the second-order maximum occur?
a. 24.4° b. 12.2° c. 7.79° d. 25.0° e. 78.5°
The conterminous United States lies predominantly in which wind zone?
a. Westerlies b. Northeast tradewinds c. Polar easterlies d. Doldrums
How is any lead chloride in the sample removed in step 2?
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.