Specitic Heat Quiz 36 g of water is to be heated through a temperature change of 9 degrees C. How much energy will be required? (Specific heat of water is 4.184)

1,355.616Joules

Explanation:

The Amount of energy required is expressed as;

Q = mcΔt

m is the mass of water = 36g

c is the Specific heat of water = 4.184

Δt is the change in temp = 9 degree C

Substitute into the formula

Q = mcΔt

Q = 36(4.184)(9)

Q = 1,355.616Joules

The amount of heat required is 1,355.616Joules

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.