An astronaut has landed on planet n-40 and conducts an experiment to determine the acceleration due to gravity on that planet. she uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. what is the acceleration of gravity on planet n-40?

3.73 m/s^2

Explanation:

The period of a simple pendulum is given by

(1)

where

L is the length of the pendulum

g is the gravitational acceleration on the planet

The pendulum in the problem has length

L = 0.640 m

and makes 10 oscillations in 26.0 s; it means that its frequency is

And so its period is

So now we can solve equation (1) using L=0.640 m and T=2.6 s, so we can find the value of g on the planet:

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia