Two metal spheres on insulating stands have the same positive charge Q. If we reduce the distance between the spheres’ centers by a factor of two, the magnitude of the repulsive force between the spheres increases by
A. a bit less than a factor of two.
B. exactly a factor of two.
C. a bit more than a factor of two.
D. a bit less than a factor of four.
E. exactly a factor of four.
F. a bit more than a factor of four.
D. a bit less than a factor of four.
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Newton's law of gravitational force states that ____
a. an object with no force on acting on it continues at rest or moves in uniform motion in a straight line with constant velocity b. an object with no force on it moves in a straight line with constant acceleration c. for every action, there is an equal and opposite reaction d. the force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared e. an object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force
If the Sun and stars are supported by gas pressure, what supports a white dwarf?
What will be an ideal response?
During which step in the website plan shown above would you determine the website's goals and objectives?
A. Step 1 B. Step 2 C. Step 3 D. Step 4
Neglecting recoil of the gold nucleus, how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^-19 C) have to approach to within 1.95 × 10^-14 m of a gold nucleus (charge = 79 × 1.6 × 10^-19 C)? (ke = 8.99 × 10^9 N×m2/C2 and 1 MeV = 1.6 × 10^-13 J)
a. 14.6 MeV c. 18.2 MeV b. 11.7 MeV d. 22.7 MeV