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3 years ago

Pick the answer that would make the following statement true.

Physics

1 answer:

Darina [25.2K]3 years ago

4 0

Explanation:

option A is the correct answer, if the gravitational acceleration is taken 10m/s²(rounding of 9.8/ms²).

hope this helps you.

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A beam of light strikes one face of a window pane with an angle of incidence of 30.0°. The index of refraction of the glass is 1

natka813 [3]

Answer:

(a). The angle of refraction is 19.26°.

(b). That is proved that the rays in air on either side of the glass are parallel to each other

Explanation:

Given that,

Angle of incidence = 30.0°

Index of reflection of glass = 1.52

(a). We need to calculate the angle of refraction for the ray inside the glass

Using snell's law

$\dfrac{\sin i}{\sin r}=\mu$

$\sin r=\dfrac{\sin i}{\mu}$

Put the value into the formula

$\sin r=\dfrac{\sin 30}{1.52}$

$r=\sin^{-1}(0.329)$

$r=19.26^{\circ}$

(b). We know that,

The incident ray and emerging ray is equal then the ray will be parallel.

We need to prove that the rays in air on either side of the glass are parallel to each other

Using formula for emerging ray

$\dfrac{\sin e}{\sin r}=\mu$

$\sin e=\sin r\times \mu$

Put the value into the formula

$\sin e=0.3289\times 1.52$

$e=\sin^{-1}(0.499)$

$e=29.9\approx 30^{\circ}$

So, $\sin i=\sin e$

This is proved.

Hence, (a). The angle of refraction is 19.26°.

(b). That is proved that the rays in air on either side of the glass are parallel to each other

6 0

3 years ago

Every few years, winds in Boulder, Colorado, attain sustained speeds of 45.0 m/s (about 100 miles per hour) when the jet stream

emmainna [20.7K]

Answer:

271248.75 N

Explanation:

$\rho$ = Density of air = 1.14 kg/m³

v = Velocity of wind = 45 m/s

A = Area = 235 m²

From Bernoulli's principle we have the relation

$P_1-P_2=\frac{1}{2}\rho v^2\\\Rightarrow \Delta P=\frac{1}{2}1.14\times 45^2\\\Rightarrow \Delta P=1154.25\ Pa$

Force is given by

$F=PA\\\Rightarrow F=1154.25\times 235\\\Rightarrow F=271248.75\ N$

Force due to the jet stream on the roof is 271248.75 N

6 0

3 years ago

Which is a compound machine? a broom a screwdriver a slide a pair of scissors

8090 [49]

A pair of scissors .....................................

4 0

3 years ago

A bus approaches red traffic light, and slows down from a speed of 15

Keith_Richards [23]

Answer:

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Explanation:

rhtjnh65y7uy6trey56u6yh5ttrdjyj56ejjyjg

5 0

3 years ago

Read 2 more answers

A 29 kg chair initially at rest on a horizontal floor requires a 171 N horizontal force to set it in motion. Once the chair is i

Katen [24]

Answer:

a) μ = 0.602 and b) μ = 0.475

Explanation:

a) Let's use Newton's second law for this exercise. The reference system the x axis is parallel to the floor and the axis and perpendicular.

Y Axis

N-W = 0

N = W

X axis

F-fr = ma

The friction force equation is

fr = μN

At the point where the movement begins the acceleration is zero

Let's replace

F = μ (mg) = 0

F = μ mg

μ = F / mg

μ = 171/29 9.8

μ = 0.602

b) in this case we have the same formula, but the friction is kinetic

μ = F2 / mg

μ = 135/29 9.8

μ = 0.475

7 0

3 years ago