All categories

3 years ago

POINTS + BRAINLIEST TO CORRECT ANSWER

Physics

1 answer:

Elza [17]3 years ago

4 0

Answer:

Explanation:

The standard film size for one popular camera was 79 mm square.

The film was 116 mm behind the lens.

If you wanted a picture of your 1.8-m-tall friend to fill half the frame,

find:

how far away from you did she need to stand?

solution:

the other person called friend is 1.8 m tall (1,800mm) stood from the other side to fill up half of the frame of 79mm / 2 = 35 mm.

where the film behind the lens is 116mm as given.

so its a ratio and proportion:

1800 mm = 39.5 mm

x 116 mm

39.5 (x) = 1800 (116)

x = 208,800

39.5

x = 5286 mm * 1 m

1000 mm

x = 5.3 m

You might be interested in

What is the period of a wave if 3 waves passes every 6 seconds

Naya [18.7K]

Time period = time/no. of waves = 6/3 = 2s

4 0

3 years ago

Describe the compressions and rarefactions of a longitudinal wave

4vir4ik [10]

Compressions are the areas of high pressure while rarefractions are low pressure area

5 0

4 years ago

Wagon wheel. While working on your latest novel about settlers crossing the Great Plains in a wagon train, you get into an argum

OverLord2011 [107]

Answer:

I = 16.7kgm²

Explanation:

Since, Torque is given by,

\tau = F*r = I*\alpha

here, I = Moment of inertia = ??

\alpha = angular acceleration of wheel = a/r

F = tangential tension acting on the wheel = T

a = acceleration of bag of sand = 2.95 m/s^2

r = radius of wheel = d/2 = 120/2 = 60 cm = 0.60 m

from force balance on sand bag,

mg - T = m*a

T = m*(g-a)

m = mass of sand bag = 20 kg

So, I = T*r/\alpha = m*(g-a)*r/(a/r)

Using known values:

I = 20*(9.81 - 2.95)*0.60/(2.95/0.60) = 16.74

I = 16.7 kgm² = Moment of inertia of wheel experimentally

also, Moment of inertia of wheel theoretically(I') = M*r²

given, M = mass of wheel = 70 kg

I' = 70*0.60²= 25.2 kgm² = Moment of inertia of wheel theoretically

7 0

3 years ago

In the year 1178. five monks at Canterbury Cathedral in England observed what appeared to be an asteroid colliding with the moon

Lubov Fominskaja [6]

Answer: 1.28 sec

Explanation:

Assuming that the glow following the collision was produced instantaneously, as the light propagates in a straight line from Moon to the Earth at a constant speed, we can get the time traveled by the light applying velocity definition as follows:

V = ∆x / ∆t

Solving for ∆t, we have:

∆t = ∆x/v = ∆x/c = 3.84 108 m / 3.8 108 m/s = 1.28 sec

8 0

3 years ago

An object is placed at a far distance in front of a thin converging lens. Then the object (1 point) moves gradually toward the l

xeze [42]

Answer:

real, and then virtual

Explanation:

A converging lens is known as convex lens. This lens is called converging lens because it converges all light rays incident on the lens and parallel to the principal axis at the focus.

The nature of image formed by objects placed in front of this lens as mostly REAL IMAGES. The image formed becomes virtual only when the object is almost in close contact with the lens.

Based on the explanation, it can be deduced that an object placed far from a convex lens forms real images but as we move closer to the lens (almost touching the lens), the image formed overtime tends to be virtual.

8 0

3 years ago