Answer:
Explanation:
W = Fd
Engine 500(20) = 10000 J
friction 200(-20) = -4000 J
Energy increase is 10000 - 4000 = 6000 J
Answer:
rate at which energy taken is 3511.19 W
rate at which heat exhausted is 2901.19 W
Explanation:
Given data
power = 610 W
Temperatures T = 142°C = 142 + 273 = 415 K
Temperatures T2 = 69.9°C = 69.9 + 273 = 342.9 K
to find out
rate at which energy taken and heat exhausted
solution
we know the equation of efficiency of engine that is = 1 - (T2 / T1)
so efficiency = 1 - (342.9 / 415 )
efficiency is 0.17373
and we know efficiency = energy output / energy input
efficiency = energy output / energy input
0.17373 = 610 / energy input
energy input = 3511.19
so rate at which energy taken is 3511.19 W
and rate at which heat exhausted is 3511.19 - power
rate at which heat exhausted is 3511.19 - 610
rate at which heat exhausted is 2901.19 W
Answer:
Explanation:
Assuming the tension in the rope is the only force acting on the block, then we can use Newton's second law:
where
F is the net force on the block
m is the mass of the block
a is its acceleration
The tension in the rope is the only force acting on the block, so
F = T = 10 N
The mass of the block is
m = 2 kg
So, solving for a, we find the acceleration:
900 grams of lead can be added max to the tin so that it does not sink.
Explanation:
According to the Archimedes principle, an object will not sink in a medium until the density of the object exceeds the density of the medium.
The medium we have is water.
The density of medium(water) is given as ρ° = 1 g/cm³
Density of an object is simply its mass contained per unit volume.
Density = mass/volume
Volume of the tin = v = 1000 cm³
Mass of the tin = m = 100 g
Mass of lead that can be added without sinking = x
Total mass after adding lead in the tin = Mt = m + x
Total density after lead is added to the tin is given as:
ρt = (m+x)/v
Now, according to Archimedes principle, lead can be added to the tin until the density of tin is equal to the density of water.
ρt = ρ°
Mt/v = ρ°
(m + x)/v = ρ°
⇒ (100 + x)/1000 = 1
⇒ 100 + x = 1000
⇒ x = 1000 - 100
x = 900 g
Keyword: Archimedes principle
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