A70 kg human body typically contains 140 g of potassium. potassium has a chemical atomic mass of 39.1 u and has three naturally occurring isotopes. one of those isotopes, 40k, is radioactive with a half-life of 1.3 billion years and a natural abundance of 0.012%. each 40k decay deposits, on average, 1.0 mev of energy into the body.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

Which situation will produce the greatest change of momentum