In an air standard Otto cycle Y 14 with a compression ratio

In an air standard Otto cycle (Y 1.4) with a compression ratio of 8.5, the condition at the beginning of the compression stroke are 100 KPa and 27 c. 2000 KJ/Kg of heat are supplied determine the following assuming a piston displacement of 4300 cc. Hint Cv 0.7165 KJ/kg K a) Temperature and pressure at the end of each process b) Thermal efficiency c) Mean effective pressure

Solution

A 0.200 kg dart is fired horizontally at a speed of 2.75 m/s when it hits a 0.700 kg block of wood suspended by a string. The nose of the dart sticks into 0.00210 m the wood. Together the dart and block swing upwards from a height of 0.0500 m above a table to 0.128 m above the table. Which of the following is the average force the dart applies to the block during impact?

a. 32.4 N

b. 15.1 N

c. 1.36 N

d. 0.872 N