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3 years ago

What is Law of reflection ?

Physics

1 answer:

Dmitriy789 [7]3 years ago

4 0

Answer:

"*The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence lie in the same plane.

*The angle which the incident ray makes with the normal is equal to the angle which the reflected ray makes to the same normal.

*The reflected ray and the incident ray are on the opposite sides of the normal."

Explanation:

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A 0.270 m radius, 510-turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a

vlada-n [284]

Answer:

0.35701 T

Explanation:

$B_i$ = Initial magnetic field

$B_f$ = Final magnetic field

$\phi$ = Magnetic flux

t = Time taken = 4.17 ms

N = Number of turns = 510

$\epsilon$ = Induced emf = 10000 V

r = Radius = 0.27 m

A = Area = $\pi r^2$

Induced emf is given by

$\epsilon=-N\frac{d\phi}{dt}\\\Rightarrow \epsilon=-N\frac{B_fAcos90-B_iAcos0}{dt}\\\Rightarrow \epsilon=N\frac{B_iA}{dt}\\\Rightarrow B_i=\frac{\epsilon dt}{NA}\\\Rightarrow B_i=\frac{10000 \times 4.17\times 10^{-3}}{510\times \pi 0.27^2}\\\Rightarrow B_i=0.35701\ T$

The magnetic field strength needed is 0.35701 T

4 0

4 years ago

A ball is thrown vertically upward with a

Veronika [31]

Answer:

1) The maximum height reached is approximately 39.715 m

2) The time it takes the ball to reach the its highest point is approximately 2.85 s

Explanation:

1) The vertical velocity of the ball, u = 27.9 m/s

The acceleration due gravity, g = 9.8 m/s²

The kinematic equation that gives the height, h, reached by the ball is given as follows;

v² = u² - 2·g·h

Where;

v = The final velocity of the ball = 0 m/s at the maximum height

h = The height reached by the ball = $h_{max}$ at maximum height

Therefore, by substitution of the known values, we have;

v² = u² - 2·g·h

0² = 27.9² - 2 × 9.8 × $h_{max}$

2 × 9.8 × $h_{max}$ = 27.9²

$h_{max}$ = 27.9²/(2×9.8) ≈ 39.715

The maximum height reached = $h_{max}$ ≈ 39.715 m

2) From the kinematic equation of motion, v = u - g·t, we have the time, t, it takes the ball to reach the maximum height given as follows

At maximum height, the final velocity, v = 0 m/s, therefore, we have;

0 = 27.9 - 9.8 × t

9.8 × t = 27.9

t = 27.9/9.8 ≈ 2.85

The time it takes the ball to reach the maximum height = t ≈ 2.85 seconds.

6 0

3 years ago

what will be evidence of a galaxy moving toward earth? A. The galaxy has a loose, disorganized appearance b. the stars in the ga

oksano4ka [1.4K]

Choice D). is on the right track, but it's stated incorrectly.

The wavelengths of light coming from a galaxy that's moving toward us are 
shorter than they were when they left the galaxy. When we see them, they're
shorter than they should be.

(This is called a "blue shift" in the spectrum of the galaxy, because blue is the
short-wavelength end of the spectrum of visible light. If the wavelength of some
light somehow becomes shorter, then the color of the light changes toward the
direction of blue.)

If the source of light is moving toward us, then the wavelength we see is shorter
than it should be. If the source is moving away from us, then the wavelength
we see is longer than it should be. The whole trick to this is knowing what the
wavelength of the light we see should be !

5 0

4 years ago

What multiple of the time constant τ gives the time taken by an initially uncharged capacitor in an RC series circuit to be char

podryga [215]

Answer:

t / τ₀ = 2.9

the time constant has to be multiplied by approximately three

Explanation:

The expression for long of a capacitor is

q = q₀ (1- e (-t/τ₀)

Where q is the charge and τ₀ is the time constant. What is found for when the initial capacitor charge at 63.5% (e⁻¹) of the maximum charge

In our case we are asked that the load be 94.5%, this means that

q/q₀ = 94.5%

q/q₀ = 0.945

Let's replace and calculate

q/q₀ = 1 - e (-t/τ₀)

0.945 = 1 - e (-t/τ₀)

(-t /τ₀) = ln (1 -0.945) = ln (0.055)

t / τ₀ = 2.9

the time constant has to be multiplied by approximately three for this charge

5 0

4 years ago

which component of the Star Wars movies is possible according to our current understanding of physics?

Alex777 [14]

Star Wars uses science and technology in its settings and storylines, although its main focus is not necessarily on science. The component of the Star Wars movies which is possible according to our current understanding of physics is their interstellar travel.
The behavior of spacecraft engaged in battle is another aspect of the films is troubling the scientists. According to them, when hit in space by a blaster, the crafts should continue moving in the same direction as the impact rather than falling downwards as the effects of gravity would not apply while in orbit.

4 0

3 years ago