The amount of metal in a closed cylindrical can that is 10 cm high and 4 cm in diameter if the metal on the top and the bottom is 0.1 cm thick and the metal on the sides is 0.05 cm thick is 8.8 cm.
The formula for calculating the volume of a cylinder is given below.
V = πr^2 h
Get the differential of the volume as shown:
dV = V/ h dh + V / r dr
V/ h = πr^2
V/ h = 2 πr h
Now, the differential becomes
dV = πr^2dh + 2πrh dr
Given the following parameters i.e. diameter and height
dh = 0.1 + 0.1 = 0.2 cm
dr = 0.05 cm
h = 10 cm
d = 4 cm
r = 2cm
Substituting the values in the above equation, we get
dV = 3.14(2)^2(0.2) + 2(3.14)(2)(10)(0.05)
dV = 2.512 + 6.28
dV = 8.792 cm
dV = 8.8 cm
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<span>The erratum in this sentence is that clothes are removed from the water by the action of centripetal force. The holes in the washing machine drum enables the clothes to move along the circular path. The holes also enable the water to escape from the machine and pushes the water to move alon gthe circular motion as well. While there is motion, the holes keep the clothes moving inward.</span>
I would say 3 is the answer
Answer:
$10.08
Explanation:
There are 24 hours in a day.
Now, if we assume that the refrigerator uses the 200 Watts per hour, thus, in one day, it will consume;
200 x 24 = 4800 watts
Thus, in 30 days, it will consume;
4800 x 30 = 144,000 Watts
Now, 1000 watts = 1KW
Thus,144,000 watts = 144,000/1000 = 144 KW
Now, since the power company charges $0.07 per kWh, thus the cost for 144 KW = 144 x 0.07 = $10.08
Answer:
d = 9.69 cm
Explanation:
given,
mass of the block = 1.2 Kg
spring force constant(k) = 730 N/m
spring is compressed = d = ?
rough patch width = 5 cm
μ_k = 0.44
work done by friction = energy lost
d = 0.0969 m
d = 9.69 cm