Answer:
5..No work is being done.
Explanation:
Hello!
Remember that the concept of work is defined as the force required to move a certain body distance, it is calculated as the product of force by distance.
therefore, the work required to raise the box is 150J.
However, the work required to keep the box lifted without moving is zero since although the box has a force due to the weight it does not move.
Answer:
The Electric field will be 225.92 N/C
Explanation:
Given :
- Radius of the hollow sphere R=42.8 cm
- Initial charge on the conducting sphere is

- Magnitude of the point charge

We know that the flux of the electric field through a close surface cab be calculated by using Gauss Law which is

Hence the Electric Field is calculated.
The answer founded out by you seems to be correct and very close to the exact answer and the concept you have used in your answer is also correct.
Lucite has a refractive index of n=1.50. This means that the speed of the light in lucite is decreased according to:

where

is the speed of light in air. Putting the number in the formula, we find that the speed of light in lucite is

The frequency of the light is

, so now we can calculate the wavelength in lucite by using the formula:

<span>Therefore, the correct answer is (2) 393 nm.</span>
Answer:
Sherpas do work that is much more meaningful than the work other climbers do.
Explanation: