Students designed an experiment to determine how a force exerted on a system does work on that system as it moves through a displacement. In this case, the force is provided by the hanging mass m2 and the displacement is the vertical distance h indicated on the diagram. The mass of the string and the friction in the pulley are negligible, but there is a non-negligible force of friction Fk between m1 and the table. Assume that the system does move when released, and that the speed upon hitting the floor is v. Which of the following is a correct relationship between the quantities involved in the experiment? (A) m2gh=12m1v2
(B) m2gh-Fkh=12m1v2
(C) m2gh-Fkh=12(m1+m2)v2
(D) m2gh=12(m1+m2)v2

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

Ablock of mass 1.5 kg slides down an inclined plane that has an angle of 15. if the inclined plane has no friction and the block starts at a height of 3 m, how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2. a. 6.8 j b. 50.9 j c. 0 j d. 44.1 j

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?