Length Contraction: Two stars are at rest relative to each other. In their common rest frame, these stars are 90.0 light-years apart. If they are measured to be 68.7 light-years apart by the navigator of a spaceship traveling between them, how fast is the spaceship moving relative to these stars?
A. 0.646c
B. 0.604c
C. 0.558c
D. 0.505c
Answer: A
You might also like to view...
Suppose that the tail for a solution to the Schrödinger equation for a given potential energy function is longer in a given classically forbidden region when the energy is EA than that for a solution for energy EB. This means that
A. EA > EB. B. EA < EB. C. It is impossible to tell from the information provided.
The earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax
How many kilometers is this star from Earth? A) 1.2 × 1017 km B) 1.2 × 1014 km C) 1.2 × 1020 km D) 1.2 × 1011 km
How did conditions differ from the present era when the universe was young?
A.) The young Universe was colder, less dense, and smoother. B.) The young Universe was hotter, less dense, and smoother. C.) The young Universe was colder, less dense, and bumpier. D.) The young Universe was hotter, more dense, and smoother. E.) The young Universe was colder, more dense, and bumpier.
A 2.0-kg ball moving eastward at 3.0 m/s suddenly collides with and sticks to a 4.0-kg ball moving northward at 2.0 m/s. What is the magnitude of the momentum of this system just after the collision?
A) 10 kg ? m/s B) 6.0 kg ? m/s C) 8.0 kg ? m/s D) 2.0 kg ? m/s E) 14 kg ? m/s