You're a safety engineer reviewing plans for a university's new high-rise dorm. The elevator motors draw 20 A and behave electri
1 answer:
You might be interested in
Answer:
a. The temperature of the copper changed more than the temperature of the water.
Explanation:
Because we're only considering the isolated system cube-water, the heat of the system should be constant, that implies the heat the cube loses is equal the heat the water gains (because by zero law of thermodynamics heat (Q) flows from hot body to cold body until reach thermal equilibrium and T1>T2). So:
(1)
But Q is related with mass (m), specific heat (c) and changes in temperature ()in the next way:
(2)
Using (2) on (1):
Because we have an equality and 0.385 < 4.186 then to conserve the equality
Answer:
To obtain the power, we first need to find the work made by the force.
1) To calculate the work, we need the next equation:
So the force is given by the problem so our mission is to find 'dx' in terms of 't'
2) we know that:
So we have:
Then:
3) Finally, we replace everything:
After some calculation, we have as a result that the work is:
161.9638 J.
4) To calculate the power we need the next equation:
So
P = 161.9638/4.7 = 34.46 W
Answer:900 feet
Explanation:
Given
Velocity
it take 100 feet to stop
Using Equation of motion
where
v,u=Final and initial velocity
a=acceleration
s=distance moved
When velocity is 60 mph
s=900.08 feet