A projectile (a stale doughnut for instance) is launched with a speed of 50.0 m/s and an angle of 35.2 degrees above the horizontal, from the top of a 75.0 m high cliff onto a flat valley floor at the base of the cliff. (a) How long (s) does it take the projectile to reach the valley floor? (b) What is the horizontal distance (m) between the base of the cliff and the impact point? What is the (c) vertical (m/s) component of the velocity just before impact? What is the (d) horizontal (m/s) component of the velocity just before impact?

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?

5400 j of energy are given off when a 50 g of aluminum pan changes temperature. does the temperature of the pan increase or decrease and by how much?