Which statement BEST describes how muscles respond to weight training? A.
Weight training stretches the muscles' limits and makes the muscles longer.
B.
Weight training pushes the muscles' abilities, making the muscles gain endurance.
C.
Weight training stimulates the muscles and causes the muscle fibers to sit closer together.
D.
Weight training overloads muscles, which causes the body to respond by making muscle fibers larger.

An apple is falling from a tree. disregarding air resistance, which diagram shows the free-body diagram of the force or forces acting on the apple?

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

Which best represents the law of conservation of mass ?