Answer:
50 N ---->
Explanation:
Opposing sides get subtracted so~
25-25 cancels out to zero so there is 0N
100 -50 equals 50 N ->
ANSWER:
C. The temperature is higher in Box A.
STEP-BY-STEP EXPLANATION:
The higher the kinetic energy, the higher the temperature.
If there is more kinetic energy in box A than in box B, it is because box A has a higher temperature.
Therefore, the correct answer is: C. The temperature is higher in Box A.
50N x 2m =100J
Work= force x distance
90 watts = 0.09 KW
Energy = (power) x (time) =
(0.09) x (24) KWh
Cost = (energy) x (unit price) =
(0.09 x 24) x ($0.51) = <em>$1.10</em> per day (rounded)
(Those are very expensive kWh's.)
Answer:
The magnitude of the field is 8.384×10^-4 T.
Explanation:
Now, i start solving this question:
First, convert the potential difference(V) 2 kv to 2000 v.
As, we have the final formula is qvB = mv^2/r. It came from the centripetal force and the magnetic force and we know that these two forces are equal. When dealing with centripetal motion use the radius and not the diameter so
r = 0.36/2 = 0.18 m.
As, we are dealing with an electron so we know its mass is 9.11*10^-31 kg and its charge (q) is 1.6*10^-18 C.
We can solve for its electric potential energy by using ΔU = qV and we know potential energy initial is equal to kinetic energy final so ΔU = ΔKE and kinetic energy is equal to 1/2mv^2 J.
qV = 1/2mv^2
(1.6*10^-19C)(2000V) = (1/2)(9.11*10^-31kg) v^2
v = 2.65×10^7 m/s.
These all above steps we have done only for velocity(v) because in the final formula we have 'v' in it. So, now we substitute the all values in that formula and will find out the magnitude of the field:
qvB = mv^2/r
qB = mv/r
B = mv/qr
B = (9.11*10^-31 kg)(2.65×10^7 m/s) / (1.6*10^-19 C)(0.18 m)
Hence, B = 8.384*10^-4 T.
