Question
solve number 5 and 6
How far would you have to stretch a spring with k = 1.5 kN/m for it to store 200 J of energy Space explorer land on a planet that has the same mass as Earth, but find their weight twice as much as they would on Earth. What is the planet's radius Earth's distance from the Sun varies from 1.47 * 10^11m at perihelion to 1.52 * 10^11 m at aphelion because its orbit is not quite circular. Find the change in potential energy as Earth goes from perihelion to aphelion A 28-kg child sits at one end of a 4.0m-long seesaw. Where should his 65-kg father sit so that the center of the mass will be also at the center of the seesaw An alpha particle (^4He) strikes a stationary Uranium nucleus (^235U)head-on and elastically. What fraction of the alpha's kinetic energy is transferred to the Uranium
Explanation / Answer
5)
let x be the distance from other end of see saw
balancing moment about center of mass
65(2-x) = 2x28
x = 1.138 m from other end
6 )
the alpha particle rebounds with same speed
kinetic energu transferred is zero percent
