Scientists using the hubble space telescope have observed cepheids in the galaxy m 100. here are the actual data for three cepheids in m 100:
cepheid 1: luminosity = 3.9×1030 watts, brightness 9.3×10−19watt/m2
cepheid 2: luminosity = 1.2×1030 watts, brightness 3.8×10−19watt/m2
cepheid 3: luminosity = 2.5×1030 watts, brightness 8.7×10−19watt/m2
compute the distance to m 100 with data from each of the three cepheids.
express your answers using two significant figures. enter your answers numerically separated by commas.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.