A metre rule is supported at its middle point O. The block of weight 10N is suspended at point B,40 cm from O. find the weight of the block that balances it at point A,25 cm from O. I got 16N is it correct?
The way i did was 10N×40cm=400Nm
400Nm÷25cm= 16N​

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?

Acircular aluminum shaft mounted in a journal is shown. the symmetric clearance gap between the shaft and journal is filled with sae 10w-30 oil at t 30°c. the shaft is caused to turn by the attached mass and cord. develop and solve a differential equation for the angular speed of the shaft as a function of time.