Our Sun is a star of spectral type ________
A) M B) F C) S D) G
D
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A sprinter runs 100.0 m in 9.87 seconds. If he travels at constant acceleration for the first 75.0 m and then at constant velocity for the final 25.0 m, what was his peak velocity?
A. 17.7 m/s. B. 15.4 m/s. C. 20.3 m/s. D. 17.5 m/s.
When a speeding roller-coaster car is at the bottom of a loop, the magnitude of the normal force exerted on the car’s wheels due to its interaction with the track is
A. Greater than the weight of the car and its passengers. B. Equal to the weight of the car and its passengers. C. Less than the weight of the car and its passengers.
According to Heisenberg's uncertainty principle, electrons are more unpredictable than protons. This is because electrons
A) are negatively charged rather than positively charged. B) interact more strongly with other particles. C) have a smaller mass. D) have a smaller volume E) interact more weakly (i.e., less strongly) with other particles.
What is the mass density of argon gas at pressure 1.00 × 105 N/m2 and at temperature 300 K? The mean atomic mass of argon is 39.948 g/mol and the ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K
A) 1.00 kg/m3 B) 1.40 kg/m3 C) 1.80 kg/m3 D) 1.60 kg/m3 E) 1.20 kg/m3