If Sirius transits my local meridian tonight at 6:43 PM, when will it transit tomorrow?
What will be an ideal response?
At 6:39 PM tomorrow night, as the Earth spins once in a sidereal day.
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Free Fall: A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s2. After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air resistance. What maximum elevation does the rocket reach?
A. 160 m B. 330 m C. 320 m D. 410 m E. 490 m
Based on models, how does Jupiter's core compare in size and mass to Earth?
A) It is about the same size and mass as Earth. B) It is about 10 times as large in both size and mass as Earth. C) It is about the same mass, but is 10 times as large in size as Earth. D) It is about the same size, but has about 10 times as much mass as Earth. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
A planet speeds up in its orbit as it gets closer to the sun because of
A) the torque exerted on the planet by the sun. B) conservation of energy. C) conservation of momentum. D) conservation of angular momentum. E) inertia.
Which of the beams is due to alpha particles?
A) a B) b C) c D) all of the above E) none of the above