Answer:
F = 1200 [N]
Explanation:
Torque is defined as the product of force by Radius.

where:
T = torque = 300 [N*m]
r = radius = 50/2 = 25 [cm] = 0.25 [m]
![F=T/r\\F = 300/0.25\\F = 1200 [N]](https://tex.z-dn.net/?f=F%3DT%2Fr%5C%5CF%20%3D%20300%2F0.25%5C%5CF%20%3D%201200%20%5BN%5D)
In order for an object to sink, its density must be greater than 1g/ml.
Answer:
Q = 4 Q₀
Explanation:
This is an exercise on capacitors, where the capacitance is
C = 
if we apply the given conditions
C = \epsilon_{o} \ \frac{2A}{0.5d}
C = 4 \epsilon_{o} \ \frac{A}{d}
let's call the capacitance Co with the initial values
C₀ = \epsilon_{o} \ \frac{A}{d}
C = 4 C₀
The charge on each plate of a capacitor is
Q = C ΔV
If the potential difference is maintained, the new charge is
Q = 4 C₀ ΔV
let's call
Q₀ = C₀ ΔV
we substitute
Q = 4 Q₀
Answer:
E = 75 J
Explanation:
First, we will calculate the total power consumed by the five lamps:

Now, the energy supply can be calculated as follows:

where,
E = Energy = ?
t = time = 5 s
Therefore,
E = (15 W)(5 s)
<u>E = 75 J</u>