Five boxes, each having weight 100 N, are stacked up. The bottom box is the fifth from the top. What is the magnitude of the normal force upward exerted by the third box from the top on the second box from the top?
a. 100 N
c. 300 N
b. 200 N
d. 400 N
B
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A hydrometer is used to measure
a. the time for an object to sink. b. water (hydro). c. the volume of a quantity of water. d. liquid density.
It takes 4.00 minutes to fill a gas tank with 50.0 liters of gasoline. If the pump nozzle is 1.35 cm in radius, what is the average speed of the gasoline as it leaves the nozzle? (1 000 liters = one cubic meter)
a. 3.64 m/s b. 0.364 m/s c. 21.8 m/s d. 1.36 m/s e. 12.5 m/s
A fission reaction in which more neutrons are given off than are needed to initiate the reaction is called
A) a critical reaction. B) a chain reaction. C) a fusion reaction. D) a neutron catastrophe. E) a chemical reaction.
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 10^6 m, R = 5.0 × 10^6 m, and M = 4.0 × 10^24 kg
a. 7.8 km/s b. 3.5 km/s c. 5.4 km/s d. 6.9 km/s e. 4.8 km/s