ISRO Scientist or Engineer Mechanical 2012
For the following questions answer them individually
A model of a golf ball is to be studied to determine the effects of the dimples. A sphere 10 times larger in diameter than an actual golf ball is used in the wind tunnel study. What speed should be selected for the model to simulate a prototype speed of50 m/s?
The sound of explosion on a ship located 10km away from the beach was heard 28.6 seconds after the explosion was seen. Estimate the temperatureofair at that time.
A spherical balloon is filled with helium at sea level. Helium and balloon material together weigh 500 N.If the net upward lift force on the balloon is also 500 N, whatis the diameter of the balloon?
Air at $$ 20^\circ C $$ and $$ 10^5 $$ Pa enters the bottom of an $$ 85^\circ $$ conical flow meter duct at a mass flow rate of 0.3 kg/s, as shown in the figure. It supports the centered conical body by steady annular flow around the cone and exits at the same velocity as it enters. Estimate the weight of the body in Newtons
A jet of water issues from a nozzle with a velocity 20 m/s on a flat plate moving away from it at 10 m/s. The cross sectional area of the jet is $$ 0.01 m^2$$ and the density of water $$= 1000 kg/m^3.$$ The force developed on the plate is
An increase in pressure of a liquid from 7.5 MPa to 15 MPa results into 0.2 percent decrease in its volume. The Coefficient of compressibility of the liquid in $$ m^2/N $$ is
A reservoir of capacity $$0.01m^3$$ is completely filled with a fluid of coefficient of compressibility $$0.75 x 10^{-9} m^2/N$$. The amount of fluid that will spill over $$(in m^3)$$,if pressure in the reservoir is reduced by $$ 2 \times 10^7 N/m^2 $$ is
