One force acting on your body right now is your weight. Which of the following is the best description of the other member of the "force pair" [of which your weight is one member]?
A) The force by the surface of the seat pushing upward on your body.
B) The force by your body pushing downward on the seat.
C) The force by Earth pulling downward on your body.
D) The gravitational force by your body pushing downward on Earth.
E) The gravitational force by your body pulling upward on Earth.
E
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You want to have an electron in an energy level where its speed is no more than 66 m/s. What is the length of the smallest box (an infinite well) in which you can do this? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 5.5 µm B) 1.4 µm C) 11 µm D) 2.8 µm
A rock is suspended from a scale reads 20.0 N. A beaker of water (having a density of 1000 kg/m3 ) is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A) 2.50 × 103 kg/m3 B) 3.00 × 103 kg/m3 C) 1.60 × 103 kg/m3 D) 2.67 × 103 kg/m3 E) 2.33 × 103 kg/m3
A car is moving with a velocity (3.0 m/s)x + (1.0 m/s)y and 2.5 seconds later its velocity is (6.0 m/s)x - (3.0 m/s)y. What is the magnitude of the average acceleration of the car?
A) 0.82 m/s2 B) 1.6 m/s2 C) 2.0 m/s2 D) 4.5 m/s2 E) 6.2 m/s2
A certain ideal gas has a temperature 300 K and a pressure 5.0 × 104 Pa. The molecules have a mean free path of 4.0 × 10?7 m. If the temperature is raised to 350 K and the pressure is reduced to 1.0 × 104 Pa the mean free path is then:
A. 6.9 × 10?8 m B. 9.3 × 10?8 m C. 3.3 × 10?7 m D. 1.7 × 10?6 m E. 2.3 × 10?6 m