If the same net force is applied to a 7 kg object and a 21 kg object, then

the 21 kg object accelerates three times faster than the 7 kg object.

the 7 kg object accelerates three times faster than the 21 kg object.

both objects accelerate at the same rate because the force is the same.

neither object will accelerate because there is a net force on the objects

what is the acceleration due to gravity on mars?

a.

9.8 m/s2

c.

12.2 m/s 2

b.

3.7 m/s2

d.

0.3 m/s2

the force that pulls falling objects toward earth is call

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

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Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?