The half-life of cobalt-60 is 5.3 years. if you have a sample that contains 10.0 g of the isotope, how much will be left after 15.9 years? a. 2.5 g b. 5.0 g c. 1.25 g d. 0.625 g

What is the fate of the electrons that interact with a specimen in an electron microscope?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.