PHYSICS HIGH SCHOOL

When using a film camera, what must you do to bring an object into focus?a.move the lens toward or away from the film.
b.close the diaphragm.
c.adjust the speed of the shutter.
d.adjust the angle of the mirror.

Answers

Answer 1
Answer:

Answer:

a. move the lens toward or away from the film.

Explanation:

Lets discuss the function of different components of the camera

a). Lens : Lens position is set to focus the image on the film as we know that

(1)/(d_i) + (1)/(d_0) = (1)/(f)

here we know that position of lens can adjusted by changing the value of distance from object and that will help to focus the image on the film.

b).  diaphragm. = It is used to control the intensity of light to enter into the lens so that light is adjusted.

c). speed of the shutter = By changing the speed of shutter we can control the light entering into the lens which can control the brightness of picture

d) Angle of mirror : by adjusting the angle of mirror we can set the orientation of the image that is formed
Answer 2
Answer:

Answer:

option (A) is correct

Explanation:

To bring the object in focus, you can change  the distance between the film and the lens by moving the lens towards or away from the film.

As the lens is used to click the pictures of objects which are placed at different distances from the camera.

By using the lens formula

1 / f = 1 / v - 1 / u

Where, f is the focal length of the lens, u be the distance between lens and the object and v be the distance between image and the lens.

We can say that f is constant and u is constant so, we have  to change the value of v that means the distance between the lens and the film to focus the images of the objects on the film.

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If a hypothesis states that children who consume a large quantity of sugar in the morning will perform more poorly in school than children who do not, then what will be the independent variable? A) children eating a healthy breakfast in the morningB) children performing poorly in school C) children performing well in schoolD) children consuming a large quantity of sugar in the morning
paperclips are more dense than water. however, it's possible to make them float. what property of water allows this? how does this property relate to the molecular structure of water
The ____ law of thermodynamics states that a quantity of energy can't be completely transferred from one form into another
5) A speeding car sees a deer and slams on his breaks. He changes his speed from 30 m/s to zero with anacceleration of-3 m/s/s. How long does it take the car to stop?
According to the _____ model, the solar system formed from a cloud of dust and gas.

Enter the expression 2cos2(θ)−1, where θ is the lowercase Greek letter theta.

Answers

2cos2(θ)−1 = 0
2cos2(θ)=1
cos2(θ)=1/2
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2θ=60 degrees
θ=30 degrees

Imagine you are holding an apple. Does this apple have energy?how do you know?

Answers


-- The apple has heat energy.  If its temperature were Absolute Zero,
then the skin on my hand would freeze instantly and fall off.

-- The apple has potential energy, relative to the ground.  If I were to
release it out of my hand, gravity would do work on it and pull it with
some speed to the ground, where it would have the kinetic energy to
break some blades of grass and dig a small crater in the soil.

-- The apple has chemical energy which, if I were to expose it to
human digestion and metabolism by eating it, would change to
glucose, soak into my muscles, and make itself available to me
whenever I need vim and vigor, mental alertness, visual acuity,
and the wherewithal to to escape any unexpected beast that might
in turn set upon me with the intention of converting MY entire person
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Answer to number 8 please

Answers


Acceleration = (change in speed) / (time for the change)

(Note:  That's all the Physics there is to this problem.
The rest is all arithmetic.)
=======================================

change in speed = (40 - 20) miles/hour = -20 miles/hour
time for the change = 10 minutes

Acceleration =  (-20 miles/hour) / (10 minutes) =

                          -2 miles/hour per minute .

That's a perfectly good and technically correct expression for acceleration.
But obviously the units might make some people dizzy.  So let's try to
clean it up a little.

Notice that 10 minutes is 1/6 of an hour.
So we could write the acceleration as

Acceleration = (-20 miles/hour) / (1/6 hour) = -120 miles/hour per hour =

                         -120 miles/hour² .

You could convert this into any units you like.  It's really not a physics problem
any more, it's just an exercise in converting units.
First segment: The airplane is descending slowly, with time and distance at a 3:1 ratio. It is probably approaching the airport

Second segment: The airplane is maintaining its altitude. It is probably waiting for the other planes to clear away

Third segment:The airplane descending rapidly, with time and distance at a 1:2 ratio. It is probably landing

Sorry, my bad.
To find acceleration, we use v2-v1 /t
40mph - 20mph / 10 min
20mph/10min
We can convert this to 20/6 miles per 10 minutes, and cancel out the 10 min to 20/6 miles, which is 10/3 miles

Table salt is blank mixed with other compunds

Answers

sodium mixed with chloride 

Astronaut John Glenn was the first American to _____.launch into space
walk on the moon
orbit the earth
do a spacewalk

Answers

Answer: orbit the earth

Explanation:

In 1962, with three orbits around the Earth, John Glenn is  the first American Astronaut to do so.

John Glen was selected in NASA in 1959. He flew Friendship 7 mission on 20th February, 1962. He was the first American to orbit the Earth. He took three rounds about the Earth.

he was the first American to orbit the earth.

A ship needs to sail to an island that is 1,000 km south of its starting point. If the captain sails south at a steady velocity of 30 km/h for 30 hours, will the ship make it? a) Yes b) No c) Insufficient information d) Maybe

Answers

No, it will not reach its point. Here is why:

Velocity x time

30 x 30 = 900 km

900 km is not equal to 1,000 km so the ship would have to sail for another 10 hours.

Hope this helps!

-namanraje777
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