1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
stiv31 [10]
3 years ago
6

Kyle lays a mirror flat on the floor and aims a laser at the mirror. The laser beam reflects off the mirror and strikes an adjac

ent wall. The plane of the incident and reflected beams is perpendicular to the wall. The beam from the laser strikes the mirror at a distance a=33.7 cm from the wall. The reflected beam strikes the wall at a height b=36.7 cm above the surface of the mirror. Find the angle of incidence θi at which the laser beam strikes the mirror.

Physics
1 answer:
Elena L [17]3 years ago
5 0

Answer:

The angle of incidence is  \theta_i  =42.6^o

Explanation:

The diagram for this question is shown on the first uploaded image

From the question we are told that

   The distance between the mirror and the wall is  a = 33.7 cm

    The height of the above the mirror is  b = 36.7 cm

Generally the angle which the reflected ray make with the mirror is mathematically evaluated as

             \alpha  =tan ^{-1} (\frac{b}{a})

substituting values

             \alpha = tan ^{-1}( \frac{36.7}{33.7})

            \alpha =47.4^o

From the diagram we can deduce that  the angle of incidence is

             \theta_i  = 90 - \alpha

So          \theta_i = 90 - 47.4

              \theta_i  =42.6^o

You might be interested in
A hockey player swings her hockey stick and strikes a puck. According to Newtons 3rd law of motion which of the following is a r
Korvikt [17]

<u>Complete Question:</u>

A hockey player swings her hockey stick and strikes a puck. According to Newton’s third law of motion, which of the following is a reaction to the stick pushing on the puck?

A. the puck pushing on the stick .

B. the stick pushing on the player .

C. the player pushing on the stick .

D. the puck pushing on the player.

<u>Correct Option:</u>

According to Newton’s third law of motion the puck pushing on the stick is a reaction to the stick pushing on the puck.

<u>Option: A</u>

<u>Explanation:</u>

As when the hockey exert force on the puck (which is a flat ball basically used in ice hockey) then this action by hockey will receive equal and opposite reaction by puck. Thus when the stick is pushing on the this flat ball, then puck also push the stick. This is understood by newton's third law pf motion, where action and reaction forces are subject of discussion, displaying their is pair of forces applied among the interacting objects. This form is observed more practically in life and very frequent.

3 0
3 years ago
A child on a high dive has a mass of 40 kilograms. If the high dive is 10 meters in the air, what is the potential energy? GPE=m
saw5 [17]

Answer:

Ep = 3924 [J]

Explanation:

To calculate this value we must use the definition of potential energy which tells us that it is the product of mass by the acceleration of gravity by height.

E_{p}=m*g*h\\

where:

Ep = potential energy [J] (units of Joules)

m = mass = 40 [kg]

g = gravity acceleration = 9.81 [m/s²]

h = elevation = 10 [m]

E_{p} =40*9.81*10\\E_{p} = 3924 [J]

7 0
2 years ago
2. How do the phytochemicals present in various foods help us?<br>​
vredina [299]
<h2>Answer:</h2>

Phytochemicals are compounds that are produced by plants ("phyto" means "plant"). They are found in fruits, vegetables, grains, beans, and other plants. Some of these phytochemicals are believed to protect cells from damage that could lead to cancer.

8 0
3 years ago
When light is directed on a metal surface, the kinetic energies of the photoelectrons a) are random b) vary with the frequency o
jekas [21]

Answer:

b) vary with the frequency of the light

Explanation:

The phone electric effect can be expressed as

K.E=(hv -W•)

Where K.E is the Kinectic energy

W• = work function of the metal

ν =frequency of the radiation

h = Planck's constat

Then, we can see that K.E is proportional linearly to "v" in the equation above.

Therefore, When light is directed on a metal surface, the kinetic energies of the photoelectrons vary with the frequency of the light

5 0
2 years ago
1. Current is usually the flow of
kolbaska11 [484]

Answer:

1. Current is usually the flow of <u>electrons</u>.

Explanation:

The flow of charges through a wire or conductor is called electric current.

7 0
2 years ago
Read 2 more answers
Other questions:
  • A scientist must only base his or her conclusions on observable evidence from investigation
    13·1 answer
  • Once a baseball has been hit into the air, what forces are acting upon it?
    12·2 answers
  • Astronauts often undergo special training in which they are subjected to extremely high centripetal accelerations. One device ha
    15·2 answers
  • The distance and direction between starting and ending positions​
    10·1 answer
  • an always be used to calculate the electric field. relates the electric field at points on a closed surface to the net charge en
    6·1 answer
  • with what force will the a car hit a tree if the car has a mass of 3,000 kg and a acceleration of 2m/s^2​
    5·1 answer
  • As a 3.0 kg bucket is being lowered into a 10 m deepwell, starting from top, the tension in the rope is 9.8 N. theacceleration o
    11·1 answer
  • Склянка с воздухом закрыта «пробкой» из мыльной пены.
    9·1 answer
  • if a car is moving with a speed of 50km/s then calculate the distance covered by the car in 20 seconds
    8·2 answers
  • There are 6 foundation of sports and which one you think is the most important?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!