Author Question: An amount of work equal to 3.0 J is required to compress the spring in a spring-gun. What is the ... (Read 31 times)

sdfghj · **on:** Jul 28, 2018

An amount of work equal to 3.0 J is required to compress the spring in a spring-gun. What is the launch speed of a 15 g marble?
a. 14 m/s
c. 18 m/s
b. 15 m/s
d. 20 m/s

Question 2

When gasoline is burned, it gives off 46,000 J/g of heat energy. If an automobile uses 13.0 kg of gasoline per hour with an efficiency of 18, what is the average horsepower output of the engine? (1 hp = 746 W)
a. 47 hp
c. 67 hp
b. 110 hp
d. 40 hp