A ship captain is mapping a trip and wants to know the distance the ship will travel over certain time intervals. time (hours) distance (miles)
0.5 12.5
1 25
1.5 37.5
Assuming that the ship travels at a constant speed, what is its speed?

miles per hour

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%