Velocity of the rocket center of mass before the explosion
A rocket explodes into three pieces of equal mass. Immediately after the explosion their velocities are (120 m/s, south), (240 m/s, north) and (120 m/s east). What was the velocity of the rocket's center of mass before the explosion?
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A metal cube with 40cm side is heated to 400C. it is placed in a room at 25C. Assume it behaves like a black body. Calculate the net power of cube due to radiation.
The hights of male adults are normally distributedwith mean 1.7m and standard deviation 0.2m. In a population of 400 male adults, how many would you expect to have a hight between 1.4m and 1.6m?
An air-standard Otto cycle operates with a compression ratio of 8. At the start of the compression stroke, the pressure is 15 psia and the temperature is 80 degrees F. the maximum pressure in the cycle is 550 psia.
Determine (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits the stops, (d) and the total heat transfer.
An air-standard Diesel cycle is operated with a compression ratio odf 20. The heat input is 300 Btu/lbm. At the beginning of the compression stroke, the conditions are 15 psia and 70 degrees F.
The frontal area of the bicyclist and bicycle together is 0.362 m2, the drag coefficient is 0.88, the coefficient of rolling resistance is 0.007. Determine the speed V of the bicyclist.
Calculate the magnitude and direction of the magnetic field in the region through which the current passes.
Estimate the time it takes for the chamber pressure to drop to 0.7 MPa. Assume that at the instant combustion ceases, the chamber propellant supply stops completely, and also that gamma = 1.2 and M = 20.
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