Author Question: Three different-mass projectiles are launched at different angles of elevation from the top of a ... (Read 15 times)

mpobi80 · **on:** Jul 28, 2018

Three different-mass projectiles are launched at different angles of elevation from the top of a building. Each particle has the same initial kinetic energy. Which particle has the greatest speed just as it impacts with the ground?
a. The one launched at the highest angle of elevation.
b. The one with the highest mass.
c. The one with the lowest mass.
d. They all will have the same speed on impact.

Question 2

An electrical generating plant operates at a boiler temperature of 200C and exhausts the unused heat into a nearby river at 20C. What is the maximum theoretical efficiency of the plant? (0C = 273 K)
a. 61
c. 21
b. 38
d. 41