4a. three of your friends are all sitting on one end of a seesaw. the combined weight is 275 n. the length from the fulcrum to your friends is 2.5 m. the rest of the seesaw (from the fulcrum to you) is 4.5 m. what is the ma? what effort force is needed to lift your friends?

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

The record distance in the sport of throwing cowpats is 81.1 m. this record toss was set by steve urner of the united states in 1981. assuming the initial launch angle was 45° and neglecting air resistance, answer the following. (a) determine the initial speed of the projectile. m/s