A baseball with mass of 0.14 kg has an initial velocity of 38 m/s. The bat applies a force that is much larger than the weight of the ball, and the ball departs from the bat with a final velocity of 58 m/s. The contact time between the bat and the ball is 4x10^-3s. Find a. The initial and final moments of the ball
b. The impulse produced by the bat
c. The average force exerted on the ball

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?