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4 years ago

Please help me (with explanation)

Physics

2 answers:

fiasKO [112]4 years ago

7 0

Answer:

Answer is D.

Explanation:

When you're dealing with a plane mirror, the angle of incidence (angle of incoming ray to the normal) is equal to the angle of reflection (angle of the outgoing ray to the normal.

The only situation here where that is true is in option D (both angles are 40 degrees). In the other 3 answer options, one angle is 40 degrees and one angle is 50 degrees.

pochemuha4 years ago

7 0

Answer:

Explanation:

Sciguy gave you a good explanation of what you have to do.

I'm only adding this so you can award a Brainliest.

The normal is a line that is vertical to the surface of the mirror. That makes the two angles that make up the division by the ray a set of 2 complementary angles. It is the angle between the normal and the ray the critical angle. The two angles much be equal.

A does not work. The critical angles are 40 and 50 which is not the way reflection works.

B has an extra step. You need to be talking about the complement of the incoming ray. The angle with the normal on the left is not the same as the angle and on the right.

C has the same basic problem. The outgoing ray with make a 50 degree angle with the normal. They are not equal.

D is the only possible answer. The compliment of 50 is 40 which makes the angle on the right = to the angle on the left.

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A baseball is thrown with a horizontal velocity of 40.20 m/s and no vertical velocity. If the ball leaves the pitcher's hand at

Len [333]

Option (c) is correct.

Explanation:

initial velocity along vertical=0

velocity along horizontal Vx=40.20 m/s

acceleration along the vertical=9.8 m/s²

displacement along vertical,h=2 m

using the kinematic equation

h= vi*t + 1/2 g t²

2=0(t) + 1/2 (9.8)t²

t²=0.408

t=0.639 s

now the displacement along vertical= x= Vx* t

x=40.20 (0.639)

x=25.73 m

5 0

3 years ago

What is the east component of a vector 15 m 15.0 o N of E?

galina1969 [7]

Answer:

14.49 N

Explanation:

East component (x component)

=15 m * cos 15°

=14.49N

4 0

4 years ago

Check all of the following statements that describe velocity.

Nata [24]

Answer:

Choices A, B, and C are correct.

Explanation:

Let us look at each of the choices one by one:

A. It is a vector

Yes. Velocity is a vector, or it's a speed with direction.

B. It is the change in displacement divided by the change in time.

Yes. The velocity can be written as

$v = \dfrac{\Delta\bold{x}}{\Delta t}$

where $\bold{x}$ is the displacement—a vector quantity.

C. It can be measured in meters per second.

Yes. The units of velocity are m/s, but also with a unit vector indicating the direction.

D. It is the slope of the acceleration vs. time graph.

Nope. The velocity is the slope of displacement vs. time graph.

Hence, only choices A, B, and C are correct.

4 0

3 years ago

A 75.0 W bulb is connected to a

adoni [48]

Answer:

Explanation:

W = 75 watts

V = 110 volts

Formula

W = V * I

Solution

75 = 110 * I Divide by 110

75 / 110 = I

I = 0.6818 Amperes

6 0

3 years ago

A 29.0 kg beam is attached to a wall with a hi.nge while its far end is supported by a cable such that the beam is horizontal.

Elanso [62]

The tension in the cable is 169.43 N and the vertical component of the force exerted by the hi.nge on the beam is 114.77 N.

<h3>Tension in the cable</h3>

Apply the principle of moment and calculate the tension in the cable;

Clockwise torque = TL sinθ

Anticlockwise torque = ¹/₂WL

TL sinθ = ¹/₂WL

T sinθ = ¹/₂W

T = (W)/(2 sinθ)

T = (29 x 9.8)/(2 x sin57)

T = 169.43 N

<h3>Vertical component of the force</h3>

T + F = W

F = W - T

F = (9.8 x 29) - 169.43

F = 114.77 N

Thus, the tension in the cable is 169.43 N and the vertical component of the force exerted by the hi.nge on the beam is 114.77 N.

Learn more about tension here: brainly.com/question/24994188

#SPJ1

6 0

2 years ago