A900-w microwave generator in an oven generates energy quanta of frequency 2560 mhz. (a) how many energy quanta does it emit per second? (b) how many energy quanta must be absorbed by a pasta dish placed in the radiation cavity to increase its temperature by 45.0 k? assume that the dish has a mass of 0.5 kg and that its specific heat is 0.9kcal/kg⋅k. (c) assume that all energy quanta emitted by the generator are absorbed by the pasta dish. how long must we wait until the dish in (b) is ready?

i think they are all correct

explanation:

they seem good

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

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.