EXAMPLE 4
• A 4200 N piano is pushed up a 3.5 m frictionless
plank that makes an angle of 30 degrees with the
horizontal.
• Calculate the work done by the pushing force in
sliding the piano up the plank at a slow constant
rate.

Abaseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. after it is hit, the ball leaves the bat at 50.0 m/s directly back. find the impulse of the bat on the ball. 7.25 kg*m/s 13.1 kg*m/s 5.80 kg*m/s 1.45 kg*m/s

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

If the area of a square has increased by a factor of 16, by how much has each side increased?