A certain spherical asteroid has a mass of 3.5 × 1016 kg and a radius of 8.8 km. What is the minimum speed needed to escape from the surface of this asteroid? (G = 6.67 × 10-11 N ? m2/kg2)
A) 23 m/s
B) 16 m/s
C) 520 m/s
D) 730 m/s
Answer: A
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From the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than closer ones, we conclude that
A) the Milky Way Galaxy is expanding. B) we are located at the center of the universe. C) the farthest galaxies will eventually be moving faster than the speed of light. D) the universe is expanding. E) the universe is shrinking.
We construct a closed Gaussian surface in the shape of a spherical balloon. Assume that a small glass bead with total charge Q is in the vicinity of the balloon. Consider the following statements:
A. If the bead is inside the balloon, the electric flux over the balloon's surface can never be 0. B. If the bead is outside the balloon, the electric flux over the balloon surface must be 0. Which of these statements is valid?
1.Only A is valid. 2.Only B is valid. 3.Both A and B are valid. 4.Neither one is valid.If the total energy of an electron in an accelerator is five times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 1.98 × 10^8 m/s c. 2.32 × 10^8 m/s b. 2.94 × 10^8 m/s d. 2.90 × 10^8 m/s
The first minerals to crystallize from a cooling magma have a
What will be an ideal response?