Which statement about power is correct?

1. The power of a light bulb labelled '12 V, 2 A' is 6 W. If the light bulb is
switched on for 5 hours then 430 kJ of energy are transferred.

2. A powerful appliance transfers less energy per second, so a more powerful
lamp is dimmer than a less powerful one.

3. Potential difference is the power transferred per unit charge, and the current
is the charge that flows per second.

4. The power of a travel kettle labelled '24 V, 5 A' is 120 W. If it heats water for
15 minutes then 108 000 J of energy are transferred.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation