As a muscle contracts and exerts more stress, it stiffens. Test the model by holding a small heavy object in one hand. Lift the object slowly while feeling your biceps with your other hand. Does the muscle seem to be stiffest where the model predicts it should? Describe.

Player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. what is the horizontal velocity component of the ball to the nearest tenth of a m/s?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s