Answer:
V = L A = L pi R^2 volume of wire
V = 50 cm * .01 cm^2 = .5 cm^3
d(density) = 3.5 gm / .5 cm^3 = 7.0 gm/cm^3
A micrometer caliper could measure the diameter of the wire.
Answer:
43,555 W
Explanation:
Since the speed is constant, this means that the force applied to lift the equipment is equal to the weight of the equipment. So we can write:
where
m = 1000 kg is the mass
is the acceleration due to gravity
So,
Then the work done in lifting the equipment is:
where
d = 200 m is the displacement of the equpment
Substituting,
Finally, the power used to lift the equipment is the ratio between the work done and time taken:
where
t = 45 s is the time taken
Solving,
Answer:
418.6 J
Explanation:
We know the specific heat for water is 4.186 kJ/kg * °C, so this can also write as 4.186 J/g * °C, so the heat increases 5 C in this question, so you can get 4.186(J/g * C) * 5C * 20g = 418.6 J