Answer:
33.65 N
Explanation:
Force that will push them away is given from the equation;
F = Kq1•q2/r²
Where;
K is coulumbs constant = 8.99 × 10^(9) Nm²/C²
We are given;
q1 = q2 = -2 C
r = 32692 m
Thus;
F = 8.99 × 10^(9) × (-2) × (-2)/32692²
F ≈ 33.65 N
Answer:
8 kgm/s
Explanation:
Since the formula for kinetic energy is:
where m is the mass and v is the velocity. If energy is conserved, mass is conserved, it would mean the speed is the same as well. And since the momentum is defined as the product of mass and velocity. The only change in velocity, and also momentum is the direction.
So the ball momentum would change from 4kgm/s to -4kgm/s. A change of 8 kgm/s
.6(9.81)(3)
=17.65
18 J
2 significant figures
Answer:
The grating with 6000 lines produces the greater dispersion
Explanation:
Grating is referred to as any regularly spaced collection of identical, parallel and elongated elements.
The relationship between the lines per measurements of gratings and their dispersion is that; the higher the number of grating lines per measurements (which could be centimetres, metres, etc; preferably metres) increases , the smaller and the narrower the maxima becomes. Gratings with a large numbers of lines per measurements are at their peaks and they product a very sharp and accurate wavelength measurements which gives them a greater dispersion compared to gratings with lower lines per measurements.
-- The output work (energy) is (200 N) x (5 m) = 1,000 Joules
-- The input work (energy) is (50 N) x (25 m) = 1,250 Joules
-- Efficiency = (useful energy output) / (energy input)
Efficiency = (1,000 J) / (1,250 J)
<em>Efficiency = 0.8</em> or 80% (D) .
