Explain the following behaviour of molecules when its raining it is advisable not to touch a canvas tent from inside

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c.part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?