Thermodynamics — Physics STD 11 Science — Question

A monkey climbs up a slippery pole for 3 seconds and subsequently slips for 3 seconds. Its velocity at time t is given by v(t) = 2t(3 - t); 0 < t < 3 and v(t) = -(t - 3)(6 - t) for 3 < t < 6s in m/s. It repeats this cycle till it reaches the height of 20m.
At what time is its average velocity maximum?

It is a common observation that rain clouds can be at about a kilometre altitude above the ground.

A typical rain drop is about 4mm diameter. Momentum is mass x speed in magnitude. Estimate its momentum when it hits ground.

Consider a circuit containing an ideal battery connected to a resistor. Do "work done by the battery" and "the thermal energy developed" represent two names of the same physical quantity?

If each square metre of sun's surface, radiates energy at the rate of 6.3 × 10⁷J/ m²/ s and the Stefan's constant is 5.669 × 10^-8W/ m²/ k⁴. Calculate the temperature of the sun's energy assuming Stefan's Law applies to the sun's rediation.

Star A emits green coloured light and star B blue coloured. Among the two temperature of which are is more?

Explain why
To keep a piece of paper horizontal, you should blow over, not under, it.

If density is made four times, what will be the effect on the velocity of sound?

A particle executes simple harmonic motion. If you are told that its velocity at this instant is zero, can you say what is its displacement? If you are told that its velocity at this instant is maximum, can you say what is its displacement?