Answer:
toward the normal
Explanation:
Light travels at different speed in different mediums.
Refractive index is equal to velocity of the light 'c' in empty space divided by the velocity 'v' in the substance.
Or ,
n = c/v.
Light travels at a slower speed in water as compared to air because there are more number of interfering molecules in the path of the light in case of water as compared to liquid.
When a light travels from lower denser medium say water to higher denser medium say water, it bends towards the perpendicular (normal) as its speed reduces in that medium.
Answer:
8.91 %
Explanation:
Since v² = 2gy
By the relative error formula,
2Δv/v = Δg/g + Δy/y multiplying by 100%, we have
2Δv/v × 100% = Δg/g × 100 % + Δy/y × 100%
2(Δv/v × 100%) = Δg/g × 100 % + Δy/y × 100%
Δg/g × 100 % = 2(Δv/v × 100%) - Δy/y × 100%
Since Δv/v × 100% = 3.69 % and Δy/y × 100% = 5 %
Since we have a difference for the percentage error in g, we square the percentage errors and add them together. So,
[Δg/g × 100 %]² = [2(Δv/v × 100%)]² + [Δy/y × 100%]²
[Δg/g × 100 %]² = [2(3.69)]² + [5%]²
[Δg/g × 100 %]² = [4)(3.69 %)² + [5%]²
[Δg/g × 100 %]² = 54.4644 %² + 25%²
[Δg/g × 100 %]² = 79.4644 %²
taking square-root of both sides, we have
[Δg/g × 100 %] = 8.91 %
So, the percent uncertainty in the calculated value of g is 8.91 %
Answer: The wheel's average rotational acceleration is -0.4 radians per second squared (rad/s^2)
Explanation: Please see the attachments below
Answer:
(A) Velocity will be 1.88 m/sec
(b) Force will be 187.45 N
Explanation:
We have given work done = 4780 j
Distance d = 25.5 m
(A) Mass of the truck m = 
We know that kinetic energy is given by
So 
(B) We know that work done is given by
W = Fd
So 
The way I do it is suddenly, in the same sort of way that magicians try to pull a table cloth off a table when there's things on the table cloth.The sudden approach acts as an impulse of force and starts to accelerate the roll. But, the piece (assuming it has perforations) is off the roll before the roll can move, due to inertia. Then the roll will acclerate, move, slow down and stop. However, in accelerating, the roll will unravel. The bigger the impulse the more it will unravel.+++++++++++++++++++++++++++++++++++++++If on the other hand, the piece of paper is held firmly, and the roll is pulled, then the impulse is presumably given to the paper and the hand whose inertia is a lot more than that of the roll. So, I think I'd actually go for choice c)+++++++++++++++++++++++++++++++++++++This assumes that the roll is free to rotate.I think that a similar idea is behind the design and use of a "ballistic galvanometer". The charge is passed through the galvanometer quickly, as a current pulse. Then the needle starts to deflect, and the deflection is arranged to depend on the total charge that has passed through in the time of the current pulse.
