The speed of light is the speed all waves travel ?
No, only the speed of all electromagnetic waves.
It's different for ocean waves, rope waves, sound waves,
guitar-string waves, slinky waves, etc.
The speed of light is the speed electromagnetic waves travel ?
Yes. Light is one of the electromagnetic waves.
The speed of light is 3.0 x 108 m/s in space ?
Yes. That's a good approximation, and a nice easy number
to remember.
It's only about 0.07% faster than the real number: 2.99792458 x 10⁸ m/s .
The speed of light is the same in all matter ?
No. It's different in every substance, and the speed in any
substance is less than the speed in space (vacuum).
The speed of higher frequency light slows down
more than lower frequency light in matter ?
Yes, slightly. That's why the colors spread out on the way
through a prism to make a spectrum, or on the way through
raindrops to make a rainbow.
Answer:
6.9.
Explanation:
In case of product of two physical quantities with errors , the rule is that the product will contain error equal to the sum of percentage errors of the two physical quantities. Foe example P contains 2% error and Q contains 3% error then P X Q will contain 2 +3 = 5 % error.
(21 ± 1.14 %) x (14±1.9%)
Total percentage error in the result of product
1.14 + 1.19 = 2.33 %.
Produce value = 21 x 14 = 294
percent of error in it = 2.33%
value of error
= 2.33% of 294
= 6.8502 or 6.9.
Answer:
A) T = 95.12 N, B) L_man - 0.59 L
Explanation:
A) For this problem we must use the equilibrium, translational and rotational equations
∑τ = 0
Let's fix our reference system at the top of the stairs, the anti-clockwise rotation is positive
W x/2 + W_man x_man - T y = 0 (1)
Let's look with trigonometry for distances
cos 52 = x / L
x = L cos 52
sin 52 = y / L
y = L sin52
The man indicates it is at L / 3, so its distance is
x_man = L/3 cos 52
We replace
W L/2 cos 52 + W_man L/3 cos 52 - T L sin 52 = 0
T = cos 52 (W / 2 + W_man / 3) / sin 52
T = cos 52 (137/2 + 16.3 9.8 / 3) / sin 52
T = 121.75 ctan 52
T = 95.12 N
B) let's look for the maximum distance (x) that can be before breaking the rope
L_man = (-W L / 2 cos 52 + T L sin 52) / W_man cos 52
L_man / L = (-W / 2 ctan 52 + T tan 52) / W_man
L_man / L = ( -137/2 ctan 52 + 116 tan 52) / (16.3 9.8)
L_man / L = (-53.518 +148.47) /159.74
L_ma / L = 0.594
The man then climb a length of 0,59 (59%) along the length of the stairs
Ecliptical orbit, so an oval describes the shape.
Answer:
We conclude that if a flat piece of paper or blowing ball is dropped from the same height, They would hit the ground at the same time.
Thus,
option a) is correct.
Explanation:
When there is no air in the space, it is basically a vacuum.
- In other words, the vacuum can be termed as a 'space devoid of matter'.
So, when there is no air in space, it means there is no force that can act on the body.
- Therefore, no matter what objects (heavy or light) we may drop from the same height, they would all hit the ground at the same time.
As there is no force that can act on an object in the vacuum, it means every object in the vacuum seems to stand still while falling.
Therefore, we conclude that if a flat piece of paper or blowing ball is dropped from the same height, They would hit the ground at the same time.
Thus,
option a) is correct.