You are given the task of designing a dart gun powered by an ideal spring, • The mass, m, of the dart will be 0.030 kg.
• The gun barrel is to be 8.0 cm long.
• When fired horizontally, the dart is to have a velocity, v, of 4.0 m/s as it leaves the barrel of the gun.
What is the required spring constant if the spring is to be compressed the entire 8.0 cm before releasing the dart?


An air-standard stirling cycle operates with a maximum pressure of 600 psia and a minimum pressure of 10 psia. the maximum volume of the air is 10 times the minimum volume. the temperature during the heat rejection process is 100°f. calculate the specific heat added to and rejected by this cycle, as well as the net specific work produced by the cycle. use constant specific heats at room temperature. the properties of air at room temperature are r

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.