A bicycle pump contains air at one atmosphere and 0°C. As the tire is pumped up, the volume of air decreases by 50% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change?
a. 2
b. 1
c. 0.5
d. 0.1
e. 3
a
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When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is what?
a. 0.25 b. 0.50 c. 1 d. 2 e. 4
A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?
The temperature at which water freezes is the same as the temperature at which
A) ice melts. B) water boils. C) both of these D) neither of these
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. b. increases. c. decreases. d. doubles every 4.0 seconds.