Answer:
Explanation:
Let q be the charges on each spheres , 2d be the distance between them in equilibrium , T be tension in the string and F be the force of repulsion between them
F = k q² /4d²
For equilibrium
T sin15 = F
T cos 15 = mg
tan15 = F / mg
F = mg tan15
k q² /4d² = mg tan15
k q² = 4d² x mg tan15
= 4 x( .7 sin15)² x 3.1 x 10⁻³ x 9.8 x .2679
= 1.068 x 10⁻³
q = .3444 x 10⁻⁶ C
no of electrons
= .3444 x 10⁻⁶ / 1.6 x 10⁻¹⁹
= 215.25 x 10¹⁰
The very first scientist was galileo and was the very first person to know the speed of light
Hi There! :)
<span>Examples of the period, frequency, speed of a wave in a sentence?
Examples
•</span><span>He indicated the space behind him with a </span>wave<span> of a hand.
</span><span>
•</span><span>On land only the grass and trees </span>wave, but the water itself is rippled by the wind.
•<span>But wherever it may turn there always will be the </span>wave<span> anticipating its movement.</span>
•<span>Harbor was completely submerged by the great </span>wave, which still came<span>
</span>
Answer: Kinetic energy is energy in motion. For example would be the energy used or the momentum used to make a car drive down a hill. The kinetic energy of an object is proportional to to the square of its speed.
Explanation:
