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 Newt