Which main sequence stars have the lowest mass?
A) spectral type O
B) spectral type M
C) spectral type A
D) spectral type G
E) can't tell from information provided
B) spectral type M
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Cepheid variable stars are more luminous than the sun
Indicate whether the statement is true or false
A 3.50-g bullet, traveling at 250 m/s, hits a hinged, light board at right angles, at a distance of 55.0 cm from its hinges, and emerges on the other side of the board with a speed of 150 m/s
The board is initially stationary but is free to rotate about its hinges and has a moment of inertia of 0.275 kg?m2. What is the angular speed of the board after the bullet emerges? A) 0.700 rad/s B) 3.05 rad/s C) 6.10 rad/s D) 0.0212 rad/s E) 22.6 rad/s
Because the factor h on the right side of the Heisenberg uncertainty principle has units of Joule-seconds, it suggests that the energy of a system also has uncertainty. The uncertainty in energy depends on the length of the time interval during which a system exists. ?E?t ? h/4?. Suppose an unstable mass is produced during a high-energy collision such that the uncertainty in its mass is
me/100 . (me = 9.11 × 10^?31 kg.) How long will this particle exist? a. 6.4 × 10^?20 s b. 2.3 × 10^?23 s c. 1.0 × 10^15 s d. 1.2 × 10^13 s e. 8.1 × 10^?19 s
A traffic light weighing 100 N is supported by two ropes as shown in the figure. The tensions in the ropes are closest to
A) 50 N. B) 56 N. C) 63 N. D) 66 N. E) 83 N.