Recall the equation relating an object's change in thermal energy to its change in temperature:
ΔQ = mcΔT
ΔQ is the change in thermal energy.
m is the mass of the object.
c is the object's specific heat.
ΔT is the object's change in temperature.
Given values:
m = 0.5 kg = 500g
ΔT = (7-0)⁰C = 7°C
Online sources say the specific heat of silver is 0.240 J/g⁰C
Substitute the terms in the equation with the given values and solve for ΔQ:
ΔQ = 500×0.240×7
<h3>ΔQ = 840 J</h3>
If you take 50 meters and divide by 23.1 seconds, you will get 2.16 meters per second.
So his average speed is 2.16 m/s.
1. It produces heat in various parts which means some useful energy is lost as heat.
<span>2. More power has to be supplied due to the losses.
</span><span>3. It resist motion.
</span><span>4. Noise is produced.
</span><span>5. </span><span>Engines consumes more fuel.</span>
Answer:
Part a)
Part b)
Explanation:
Mass of the disc is given as
m = 2.00 kg
radius of the disc is given as
r = 7 cm
so moment of inertia of the disc is given as
Now given that torque on the disc is
so here the angular acceleration is given as
Part a)
if disc start from rest and then achieve final speed as 1200 rpm then
so final speed is
now the time taken to reach this speed is given as
Part b)
Number of revolution in the same time is given as
Answer:
Its level of output in the short run should not change
Explanation:
For a monopoly, maximization of profit is only possible if marginal cost is equal to marginal revenue. The new equipment will only change the fixed cost and not the marginal cost, thus there will be no change in the level of output.