What parameters do Hubble's Law relate to each other?
A.) Galaxy rotation speed and luminosity.
B.) Galaxy classification and mass.
C.) Cepheid star period and luminosity.
D.) Galaxy recession velocity and distance.
E.) Galaxy mass and distance.
Ans: D.) Galaxy recession velocity and distance.
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If perihelion of Earth were noticeably closer to the sun than is currently the case, what would be the probable affect on the climate of the Southern Hemisphere?
a. Their winter season would be much colder than present. b. Their winter season would be much warmer than present. c. Their summer season would be much colder than present. d. Their summer season would be much warmer than present. e. Their would be no change in any of their seasonal temperatures.
A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?
A) 32.3 N B) 24.1 N C) 3.68 N D) 5.48 N E) 11.8 N
About 90% of the star's total life is spent on the main sequence
Indicate whether the statement is true or false
A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the altitude the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.