<h3>The correct answer is:</h3><h2>9.08 x 10⁶ meters.</h2><h2 /><h3>Explanation:</h3>
Fg = 2.58 x 10³ N
Mv = 4.87 x 10²⁴ Kg
Md = 655 Kg
So, Fg = G Mv Mp / r²
By putting in the values,
r² = 8.2466 x 10¹³
<h2>r = 9.08 x 10⁶ meters.</h2>
I can only help you with question 7
B is the right answer.
A is wrong because when the angle is critical angle the light leaves medium 1 parallel to the surface.
C is wrong because light reflects only when travelling from a denser to a rarer/less dense medium.speed of light is lower in denser medium.
D is wrong because the frequency of the light doesn't change when travelling from one medium to another.
Answer:
y = 3.159 m
Explanation:
Using the second equation of motion.
s = ut + 0.5at^2 .......1
Since the ball is thrown upward the acceleration due to gravity act against it.
Given:
distance s = y
Initial speed u = 12.0 m/s
Time t = 0.30 s
Acceleration a = -g = -9.8m/s^2
Equation 1 becomes;
y = ut - 0.5at^2
Substituting the given values. We have;
y = 12.0(0.30) - 0.5(9.8 × 0.3^2)
y = 3.6 - 0.441
y = 3.159 m
The answers penciled in on the sheet are fine ... 1500 Hz and 0.0006 sec.
If you want to get super-technical about it, you could count the number of full cycles on the WHOLE graph, from one side to the other. At the right end, near 0.01 sec, you can notice an extra 1/4 of a cycle there. So it's actually 15 and 1/4 cycles in 0.01 sec.
That makes the frequency (15.25 cycles) / (0.01 sec) = 1,525 Hz .
and the period ( second / 1525) = 0.000656... second.
But I think it would be OK if you didn't do that, and just call it 1500 Hz and 0.0006s.
The difference is only 1.6% , and the engineer in me says that's not enough to worry about.
