It takes 2.0 minutes to fill a gas tank with 60 liters of gasoline. If the pump nozzle is 1.0 cm in radius, what is the average speed of the gasoline as it leaves the nozzle? (1000 liters = one cubic meter)
a. 0.27 m/s
c. 1.6 m/s
b. 1.1 m/s
d. 64 m/s
C
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What form of convection causes the onshore sea breeze in the day?
A. natural convection of air falling over the cooling land B. forced convection air or force convection of water C. forced convection of water D. natural convection of air rising over the warming land
The decoupling of the strong force from the electroweak force provided energy for a rapid inflation of the Universe
a. True b. False Indicate whether the statement is true or false
A shoe on an inclined surface barely remains at rest when friction equals the
A) weight mg of the shoe. B) component of mg perpendicular to the surface. C) component of mg parallel to the surface. D) none of the above
A heavy man and a light man parachute together from a high-flying plane. The first to attain zero acceleration will be the
1) light man 2) heavy man 3) both will attain zero acceleration at the same time. because 4) the gravitational force on each man is the same. 5) of the lesser gravitational force acting on the lighter man. 6) air resistance will eventually counterbalance the weights of both men. 7) the lighter man will not have to fall for as long a time before air resistance equals his weight.