A 0.02kg ball at rest was launched from a slingshot with a force of 200N for 0.05sec. The ball as launched at 25° above the horizontal Find the change in momentum.
Lind the velocity of the ball as it left the slingshot.

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?

Aspring that is stretched 2.6 cm stores a potential energy of 0.053 j. what is the spring constant of this spring?