Consider two planets of mass m and 2m,
respectively, orbiting the same star in circular
orbits. the more massive planet is 4.5 times
as far from the star as the less massive one.
what is the ratio f1 : f2 of the gravita-
tional forces exerted on the star by the two
planets?
what is the ratio v1 : v2 of the speeds of the
two planets?
what is the ratio t1 : t2 of the orbital periods
of the two planets?

Eddy whose mass is 55kg climbs up the 1.50 meter high stairs in 2s.calculate eddy’s power rating

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?