The mover is pushing on the box, meaning that when hes pushing on the box hes adding force to the box to make it move. The box cant move without force.
80 (km / hour) * (1,000 meters/ km) * (1 hour/ 60 minutes) * (1 minute / 60 seconds) = 22.2 meters / second
Answer:
The angle of elevation of the Sun = 41.8°
Explanation:
Let the angle of elevation of the sun be θ
Using trigonometric relations,
Tan θ = opp/adj
opp = the height of the Washington Tower = 555 ft
adj = the length of the shadow = 620 ft
Tan θ = (555/620) = 0.8952
θ = Tan⁻¹ (0.8952) = 41.8°
Hence, the angle of elevation of the Sun = 41.8°
Triton was discovered by British astronomer William Lassell on October 10, 1846, just 17 days after the discovery of Neptune.
Triton is named after the Greek sea god Triton (Τρίτων), the son of Poseidon (the Greek god corresponding to the Roman Neptune).
Three
The ray of light will come out of the glass at 90 degrees to the normal. What goes in is called the critical angle. At 90 degrees the ray will reflect rather than refract. This is just for interest.
<em><u>Formula</u></em>
n2 * sin(θ2) = n1* sin(θ1)
<em><u>Givens</u></em>
θ2 = 90 degrees
n2 = 1
n1 = ?
θ1 = 43.6
<em><u>Solution</u></em>
n1 * sin(43.6) = 1 * 1
n1 = 1/sin(43.6)
n1 = 1/0.6896
n1 = 1.45
Four
This problem is very instructive. It uses a little known trick so that you don't have to know the exact speed of light of one of the speeds. The other speed is compared to it. You could do it the long way and figure out the speeds in crown glass from air to the crown glass, and do the same thing with the other color. That would work. An easier way is not to bother. Call the speed of one of the colors = 1. Is the other speed greater or less than 1? We'll see.
The next thing you have to realize is that the speed is going to be highest for either red or violet. That's because n is highest for violet and lowest for red. The intermediate colors don't matter. So the answer is either A or B.
They have n's between violet and red and so they will not be an answer. That means you can eliminate green and yellow (answers C and D).
<em><u>Formula</u></em>
v1/v2 = n2/n1
<em><u>Givens</u></em>
v1 = 1 (we'll say this is red)
v2 = ? (this is violet)
n2 = 1.62 for red. This is probably not exact, but it does not have to be. You just have to notice that violet is higher
n1 = 1.65 for violet. So you are trying to solve the relative speed of v2.
<em><u>Solution</u></em>
v1/v2 = n2/n1
1/v2 = 1.65/1.62 Cross multiply
1.65 * v2 = 1 * 1.62 Divide by 1.65
v2 = 1.62/1.65
v2 = 0.98
<em><u>Conclusion</u></em>.
The speed of violet is going to be slower than the speed of red.
Rule: the higher the index of refraction, the lower the speed.
Answer: red has the greater speed.
