Answer:
Explanation:
Let the linear charge density of the charged wire is given as
here we can use Gauss law to find the electric field at a distance r from wire
so here we will assume a Gaussian surface of cylinder shape around the wire
so we have
here we have
so we have
First, let's see how many moles correspond to 6.30 g of water.
The molar weight of water is 18.01 g/mol, so
Then we know it takes 6.02 kJ to melt 1 mole of ice, so if we have 0.35 mol, the amount of heat needed will be
Answer:
40 s
Explanation:
After 10 seconds, the first skater would have a 8m/s * 10s = 80 m head start
Let t be the number of seconds after the second skater starts will the second skater overtake the first skater
The distance traveled by the first skater after t seconds is
Similarly the distance traveled by the 2nd skater after t seconds is
Since the 2nd skater catches up to the 1st one after 80 m behind, the distance traveled by the 2nd one must be 80m greater than the distance of the 1st skater
We can substitute
Answer:
The average power is 619 W.
(B) is correct option
Explanation:
Given that,
Weight = 62.0 kg
Height = 4.28 m
Time t = 4.20 s
We need to calculate the work done
Work done by woman
Where,
m = mass
g = acceleration due to gravity
t = time
Put the value into the formula
We need to calculate the power
Using formula of power
Where,
W = work done
t = time
Put the value in to the formula
Hence, The average power is 619 W.
Heat is measured in joules and temperature is measured in F degrees or C degrees.