An old building is being demolished by swinging a heavy metal ball from a crane. Suppose that such a 115kg ball swings from a 20
-m-long wire at speed 12m/s as the wire passes the vertical orientation.
a) What tension force must the wire be able to withstand in order not to break?
b)Assume the ball stops after sinking 1.5 m into the wall. What was the average force that the ball exerted on the wall?
a) What tension force must the wire be able to withstand in order not to break?
b)Assume the ball stops after sinking 1.5 m into the wall. What was the average force that the ball exerted on the wall?
1 answer:
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Answer:
e=58%
Explanation:
Given data
The Otto-cycle engine in a Mercedes-Benz SLK230 has a compression ratio of 8.8.
Solution
We want to calculate the ideal efficiency of the engine when ratio of heat capacity for gas used γ=1.40. Ideal efficiency (e) of the Otto cycle given by:
Substitute the given values to find efficiency e
e=58%