Consider two nearly spherical soyuz payload vehicles, in orbit about earth, each with mass 9000 kg and diameter 4.0 m. they are initially at rest relative to each other, 10.0 m from center to center. (as we will see in kepler’s laws of planetary motion, both orbit earth at the same speed and interact nearly the same as if they were isolated in deep space.) determine the gravitational force between them and their initial acceleration. estimate how long it takes for them to drift together, and how fast they are moving upon impact.

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

What is the coefficient of kinetic friction μk between the block and the tabletop?