answer.
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
Vadim26 [7]
2 years ago
15

You are observing a 20 cm-tall object in a pinhole camera with a screen at the end. The screen is 25 cm from the pinhole. The im

age on the screen is 5 cm tall.
(1) What can you say about the image?

a. Upright, Reduced
b. Inverted, Enlarged
c. Inverted, Reduced
d. Upright, Enlarged
Physics
1 answer:
Margaret [11]2 years ago
8 0

Answer:

Upright, Reduced                    

Explanation:

Given that,

Height of the object, h = 20 cm

Image distance, v = 25 cm

Height of the image, h' = 5 cm

We know that the magnification of the mirror is given by :

m=\dfrac{h'}{h}=\dfrac{v}{u}

\dfrac{5}{20}=\dfrac{25}{u}

u = -100 cm (negative due to sign conventions)

Let f is the focal length of the lens. It can be calculated as :

\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}

\dfrac{1}{f}=\dfrac{1}{25}-\dfrac{1}{(-100)}

f = 20 cm

It is seen that the focal length of the lens is positive. So, it is a convex lens. The image formed by the convex lens is Upright, Reduced. Hence, the correct option is (a).    

You might be interested in
When working with a razor blade or exacto knife --
stich3 [128]

Answer:

last answer

Explanation:

gripping it with the blade facing downward is the most efficient and safe way to use an exacto knife

6 0
2 years ago
Write the meaning of an object has 2 meter length
Ivahew [28]

Answer:

The object has 2 meter length. This means the length is any quantity with a dimension distance. The definition of the length is how long something is or amount of space. In the given data it is stated that, the object is something that has a length of 2 meter.  

<em>Let's take examples to understand. </em>

For example a thread or a table is an object which has a total length of 2 meters.  

Another example is something we are measuring it gives us a result of 2 meters of length by using a meter scale or meter tape.    

Length is a measure of distance and it is a fundamental quantity. Meter is a international system of units (SI units).    



 



4 0
2 years ago
An elementary particle of mass m completely absorbs a photon, after which its mass is 1.01m. (a) what was the energy of the inco
sdas [7]
A.) We use the famous equation proposed by Albert Einstein written below:

E = Δmc²
where
E is the energy of the photon
Δm is the mass defect, or the difference of the mass before and after the reaction
c is the speed of light equal to 3×10⁸ m/s

Substituting the value:

E = (1.01m - m)*(3×10⁸ m/s) = 0.01mc² = 3×10⁶ Joules

b) The actual energy may be even greater than 3×10⁶ Joules because some of the energy may have been dissipated. Not all of the energy will be absorbed by the photon. Some energy would be dissipated to the surroundings.
8 0
2 years ago
What statements accurately describe sunspots? Check all that apply.
polet [3.4K]

Answer:

sunspots are storms on the Suns surface

Sunspots are marked by intense magnetic activity

Sunspots produce solar flares and hot gassy ejections.

Sunspots can affect Earth’s climate.

Explanation:

I just did this lesson

6 0
2 years ago
If you were to triple the size of the Earth (R = 3R⊕) and double the mass of the Earth (M = 2M⊕), how much would it change the g
EastWind [94]

Answer:

Decreased by a factor of 4.5

Explanation:

"We have Newton formula for attraction force between 2 objects with mass and a distance between them:

F_G = G\frac{M_1M_2}{R^2}

where G =6.67408 × 10^{-11} m^3/kgs^2 is the gravitational constant on Earth. M_1, M_2 are the masses of the object and Earth itself. and R distance between, or the Earth radius.

So when R is tripled and mass is doubled, we have the following ratio of the new gravity over the old ones:

\frac{F_G}{f_g} = \frac{G\frac{M_1M_2}{R^2}}{G\frac{M_1m_2}{r^2}}

\frac{F_G}{f_g} = \frac{\frac{M_2}{R^2}}{\frac{m_2}{r^2}}

\frac{F_G}{f_g} = \frac{M_2}{R^2}\frac{r^2}{m_2}

\frac{F_G}{f_g} = \frac{M_2}{m_2}(\frac{r}{R})^2

Since M_2 = 2m_2 and r = R/3

\frac{F_G}{f_g} = \frac{2}{3^2} = 2/9 = 1/4.5

So gravity would have been decreased by a factor of 4.5  

8 0
2 years ago
Other questions:
  • 1. I drop a penny from the top of the tower at the front of Fort Collins High School and it takes 1.85 seconds to hit the ground
    8·1 answer
  • If a 3-kg rabbit's leg muscles act as imperfectly elastic springs, how much energy will they hold if the rabbit lands from a hei
    5·2 answers
  • To practice Problem-Solving Strategy 30.1: Inductors in Circuits. A circuit has a 1 V battery connected in series with a switch.
    6·1 answer
  • An airplane cruises at 850 km/h relative to the air. It is flying from Denver, Colorado, due west to Reno, Nevada, a distance of
    11·1 answer
  • Kim has a metal casting company which makes commemorative coins. She has 0.12 cubic meters of silver which she needs to make int
    9·1 answer
  • "The drawing shows three layers of different materials, with air above and below the layers. The interfaces between the layers a
    7·1 answer
  • an ice skater, standing at rest, uses her hands to push off against a wall. she exerts an average force on the wall of 120 N and
    14·1 answer
  • We know the moon circulates the Earth. Suppose the mass of the Earth and moon are 5.9742 x1024 kg and 7.36 x 1022 kg, whereas th
    9·1 answer
  • Consider a double Atwood machine constructed as follows: A mass 4m is suspended from a string that passes over a massless pulley
    7·1 answer
  • The diagram shows a heater above a thermometer. The thermometer bulb is in the position shown. Which row shows how the heat ener
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!