John, Jane, and Joe are twins and were all born 70 years ago (in Earth's frame of reference). John spent his life in the same city. Jane spent her life in a car moving at 30 m/s. Joe spent his life on a jet plane moving at 300 m/s. (Don't ask me how they did this.)
How much younger are Jane and Joe than John?
Calculate your answer in seconds. You will need to use the binomial approximation because your calculator is not accurate enough to calculate the difference between γ and 1.

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

Ball bearings are made by letting spherical drops of molten metal fall inside a talll tower-called a shot tower- and solidify as they fall. a-if a bearing needs 4.0 s to solidify enough for impact, how high must the tower be? b- what is the bearing's impact velocity?