2atest pilot wcighing 85 kg is strapped into a large centrifuge machine for training the machine
spins rapidly to simulare increased gravitational forces on the body
a the machine spins the pilot in a cirde with a 9.9 m radius, what should be the period of
folation so that the pilot experiences a force equal to twice his body weight? what should be
the period of rotation so that the pilot experiences a force equal to three times his body
weight
b. astationary observer watches as the pilot spins in the machine. from the frame of reference of
the stationary observer, how fast is the pilot traveling as he passes by while experiencing a force
three times that of gravity? give your answer in revolutions per minute, ipm
c. if the radius of the cirde increases but the pilot continues to spin at the same speed, does the
pilot experience more or less force? what can be done to maintain the same force on the pilot?

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.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Alandscaper is shopping for landscaping materials. she wants to use materials through which water flows easily. which materials should she choose? check all that apply. clay gravel granite rocks with cracks loosely packed soil