Why is it useful to slow down neutrons produced byfi ssion in a nuclear reactor?

Two balls have their centers 3.0 m apart. One ball has a mass of 2.7 kg. The other has a mass of 4.5 kg. What is the gravitational force between them Assume G = 6.67 × 10 -1N·m /kg 2 a. 1.3 x 10 -11N -11 b. 9.0 x 10 N c. 2.7 x 10 -10N -10 d. 9.0 x 10 N According to Kepler's laws, an imaginary line from the Sun to a planet __________. a. sweeps out equal areas in equal time periods b. sweeps out larger areas the greater the planet's distance from the Sun than it would in the same time interval when closest to the Sun c. sweeps out smaller areas when the planet is closest to the Sun than it would in the same time interval when farthest from the Sun d. remains a constant length through the entire orbit of that planet According to Newton's law of universal gravitation in the case of a planet near the Sun, which of the following would cause the attractive force to be quadrupled a. square the mass of the planet b. Double the distance from the sun c. Quadruple the distance from the sun d. Quadruple the mass of the planet If you weigh 500.0 N on Earth's surface, how much would you weigh on the planet Jupiter Jupiter has a mass of 1.90 × 10 kg and a radius of 71.5 × 10 m. a. 1260 N b. 1.26 N c. 12.6 N d. 12600 N The force of gravity between two objects is a. Inversely proportional to the distance between them. b. Directly proportional to the distance between them c. Inversely proportional to the square of the distance between them d. Directly proportional to the square of the distance between them Two ob