In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.50 km?
A) 157 m/s
B) 314 m/s
C) 78.5 m/s
D) 255 m/s
E) 510 m/s
A
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Which of the values below is closest to the magnitude of W?
A. 0.6 J B. 1.5 J C. 300 J D. 600 J E. 1500 J F. 3000 J
An electron is accelerated from rest through a potential difference of 50.0 kV. What is the speed of the electron? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 1.24 × 108 m/s B) 1.33 × 108 m/s C) 3.24 × 108 m/s D) 3.33 × 108 m/s E) 4.12 × 108 m/s
During a full Moon, where is the Moon relative to the Sun and the Earth?
A) at a 45 degree angle from the Sun B) on the opposite side of the Earth from the Sun C) on the opposite side of the Sun from the Earth D) at a 90 degree angle from the Sun E) between the Sun and the Earth
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016