Answer: force, force
Explanation:
Newton’s third law states that there and equal and opposite force on an object.
I took the test as well
Answer: A) circles that are concentric with the wire.
Explanation: In order to explain this problem we have to take into account the Ampere law which is given by:
∫B*dl=μo*I where I is the current and μo the vacuum permeability.
So for any distance r from the wire the magnetic field is constant then we have:
B=μo*I/(2*π*r), this means that the magnetic field lines are circles concentric with the wire and they decrease as far the lines are from the wire.
Answer:
A) 37°
Explanation:
The formula for the critical angle is:
Where,
is the critical angle
is the refractive index of the refractive medium. = 1.33
is the refractive index of the incident medium. = 1.43
Applying in the formula as:
The critical angle is = sin⁻¹ 0.93006 = 68.4442°
Angle of incidence is half of the critical angle. So,
Angle of incidence = 68.4442° / 2 = 34.2221°
Using Snell's law as:
Where,
is the angle of incidence ( 34.2221° )
is the angle of refraction ( ? )
is the refractive index of the refraction medium (water, n=1.33)
is the refractive index of the incidence medium (glass, n=1.43)
Hence,
Angle of refraction= sin⁻¹ 0.6047 = 37°.
Newton’s law of gravity is considered “universal” because it is believed to be applicable to the entire Universe (to a good approximation). Gravity does not just pull an apple from a tree, but also pulls the Moon to the Earth, the Earth to the Sun, and so on. Gravity is a fundamental force of nature.
Find the intensity of the electromagnetic wave described in each case.
(a) an electromagnetic wave with a wavelength of 645 nm and a peak electric field magnitude of 8.5 V/m.
(b) an electromagnetic wave with an angular frequency of 6.3 ✕ 1018 rad/s and a peak magnetic field magnitude of 10−10 T.