A 6 cm object is 8 cm from a convex lens that has a focal length of 2.7 cm. The image is 4 cm from the lens.

The height of the image is
cm ______

Answer:

Toaster

Explanation:

A toaster draws electric current (electrical energy) from a wall outlet and converts these moving electric charges into heat (thermal energy) in the filaments that turn red hot to cook your toast. ... As electricity runs through the filaments in a space heater, the electrical energy is converted into heat (thermal energy).

Answer:

2

Explanation:

To find force it's force = mass times acceleration so to find mass you would divide force by acceleration

Answer:

the answer is B

Explanation:

edg 2020

Answer:

a sense of industry

Explanation:

I just had this question and got it right

Answer:

If there is a net force acting on an object, the object will have an acceleration and the object's velocity will change. ... Newton's second law states that for a particular force, the acceleration of an object is proportional to the net force and inversely proportional to the mass of the object.

Explanation:

If the motion of an object changes, the net force on the object is greater than zero or the forces acting on the object is unbalanced.

According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object. The object will move in the direction of the applied force.

When the net force on an object is zero, the object will be remain at rest.

However, when the net force on object is greater than zero, the object will move in the direction of the greater force.

Thus, we can conclude that if the motion of an object changes, the net force on the object is greater than zero or the forces acting on the object is unbalanced.

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Answer:

The answer is B. hope this helps

Explanation:

Answer:

A compass can detect a magnetic field and show its direction. Iron filings can show the shape of a magnetic field. A gaussmeter can detect a field and indicate its strength.

Explanation:

Explanation:

NH3 is the correct answer

please give brainliest and helpful

Answer:All three states of matter (solid, liquid and gas) expand when heated. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Explanation:well I tried lol she just copied and pasted faster than I could

Answer:

closed

Explanation:

sorry if I'm wrong

Answer:

Aim: To investigate which material of pot will cook food quicker.

Hypothesis: The (aluminum/enamel) pots will cook the food quicker than the (aluminum/enamel) pots.

Apparatus:

- Aluminum pots

- Enamel pots

- Stove top

Variables:

Independent variable (What will be changed) - Material of pot

Dependent variable (What's being measured) - Time taken for food to cook

Controlled variables (What's staying the same) - Size of pot, type of food being cooked, quantity of food being cooked, stove top

Method:

Results: (I don't have results because i never conducted this experiment)

Conclusion: This experiment showed that (aluminum/enamel) pots cooked the food quicker than (aluminum/enamel pots). These results (supported/rejected) my hypothesis.

Evaluation: (Never did the experiment, so there's nothing to evaluate)

Explanation:

I hope this helps :)

Answer:

The first picture/option

Explanation:

The first picture/option shows the best way for Rafael to set up the investigation.

The experimental set-up must be in a sloppy position in order to simulate the condition that is characteristic of the bottom of the hill where he stays. Hence, the two soil samples must be tilted in order to determine if the grass can help to stop the washing down of the soil from the top of the hill.

The two options following the first option do not fulfill the condition of the same treatment. Both soil samples must be subjected to the same treatment condition in order for the outcome to be valid. The last option could have also been admissible but did not simulate the hill/slope conditions of where Rafael stays.

To set up his investigation on whether grass can help stop soil erosion on a hillside, Rafael can follow these steps: 1. Collect two samples of the same size and type of soil. This ensures that the only difference between the two samples is the presence of grass.

2. Place each sample of soil in a small tray. This allows Rafael to contain the soil and prevent it from mixing with each other.

3. Pour the same amount of water onto both samples of soil. This ensures that the water input is consistent for both samples, allowing Rafael to compare the effects of grass on soil erosion.

4. Use a large tray to collect water that may flow through the soil. This allows Rafael to measure and compare the amount of water runoff from both samples. By collecting the water, Rafael can determine if the grass on the hillside helps to retain more water and prevent soil erosion.

By following these steps, Rafael can compare the water runoff and soil erosion between the sample with grass and the sample without grass. This will provide him with evidence to determine if grass can effectively help stop soil erosion on a hillside.

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Answer:

20

Explanation:

W = F*d

400 = 20*d

d = 20

Answer:

materials: solid dissolved in a liquid

independent variable: temperature

Explanation:

I got it right

Answer:

kg•m^2/s^3

Explanation:

Here, we want to get the valid unit for power

Mathematically, power is time rate of doing work

Work is the product of force and distance

Unit for force is;

kg•ms^-2

work is;

Kg•ms^-2 • s

= kg•m^2•s^-2

Divide through by the s for time;

we have ;

kg•m^2•s^-2/s

kg•m^2•s^-3

And that is;

kg•m^2/s^3

Answer:

A

Explanation:

I took the test on progress learning and got it right.

If we increase the velocity of an object by 1 meter per second, as a result the kinetic energy of the object will increase as velocity is directly proportional to the kinetic energy.

The kinetic energy of an object is the energy which the object possesses due to its motion. Kinetic energy is defined as the work which is required be done to accelerate an object of a given mass from the state of rest to its stated velocity.

Kinetic energy is the energy possessed by an object due to its motion. Potential energy is the form of energy which is possessed by an object due to the position or state. Kinetic energy is directly proportional to the mass and velocity of the object. Therefore, if we increase the velocity of an object, then kinetic energy of the object will increase.

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Answer:

A

Explanation:

Put A, It will help you.

Answer:

 m = 1,429 10⁻⁴ kg

Explanation:

For the object to remain floating, the translational equilibrium condition must be met, we set a reference system where the vertical upward direction is positive

          F_e -W = 0

          F_e = W

          q E = m g

we clear

         m = [tex]\frac{qE}{g}[/tex]

let's calculate

        m = [tex]\frac{7 \ 10^{-6} \ 200}{ 7 }[/tex]

        m = 1,429 10⁻⁴ kg

Explanation:

Average Speed.=Total distance/Total time=800/10=80m/hour

Answer:

Centripetal acceleration = 8m/s²

Explanation:

Given the following data;

Radius, r = 2m

Velocity = 4m/s

To find the centripetal acceleration;

Centripetal acceleration = V²/r

Substituting into the equation, we have;

Centripetal acceleration = 4²/2

Centripetal acceleration = 16/2

Centripetal acceleration = 8m/s²

Therefore, the dog's centripetal acceleration is 8 meters per seconds square.

Answer:

Decrease

Explanation:

If you were on the Moon, which has significantly less mass than the Earth, your weight would: decrease

The point that seemed to be giving me a complicated time was being able to distinguish the difference and meaning of weight and mass and being able to apply that to a problem. I kept mixing up the definitions. For example in homework 3.1, one question asked:

If you were on the moon, which has significantly less mass than the earth, your mass would:

a. increase

b. decrease

c. stay the same

d. become zero

The definition of mass is the amount of matter in an object. The definition of weight is the amount or unit of force. For me, I just had to remember that when it asked about weight, it wasn’t referring how heavy an object is. After I was able to recognize that when it came to weight, questions became easier.

The final and correct answer was decreasing. The answer is because the Moon’s mass is less. This means the gravitational force is less on your body, therefore, your mass is going to be lighter

Answer:

Helium has many unique properties: low boiling point, low density, low solubility, high thermal conductivity and inertness, so it is use for any application which can explioit these properties. Helium was the first gas used for filling balloons and dirigibles

Answer:

The change in pitch of a siren on an ambulance

Answer:

Explanation:

The drop in pitch of ambulance sirens as they pass by and the shift in red light are common examples of the Doppler Effect.

Answer:

C. 0.50 m

Explanation:

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The amplitude of the vibration with the given equation, y = (0.50) cos (π/2 ×t) is 0.50 m. Thus, option C is correct.

Simple Harmonic motion is defined as the periodic motion of the body resulting from the dynamic equilibrium. It is defined as the motion in which the restoring force is directly proportional to the displacement of the body.

Simple Harmonic Motion is defined as the repetitive back-and-forth motion of the central displacement. The maximum displacement of one side is equal to the maximum displacement of the other side.

The simple harmonic motion. F ∝ -x or a ∝ -x, where F is force and a is the acceleration of the body, and x is the displacement. The maximum displacement of the body is called the amplitude of the motion.

The energy is purely kinetic at its mean positions whereas the energy is purely potential at its extreme ends. The harmonic motion is also called oscillatory motion.

From the given, SHM equation, y = A sin(ωt) where A is the amplitude of the wave and ω is the angular frequency of the wave. In the cosine function,  y = A cos(ωt + Ф) where Ф is the phase change.

Thus, the amplitude of the vibration is 0.50 m. Hence, the correct option is C.

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Answer:

The electric force is directly proportional to the amount of Charge.

Explanation:

We define the electric force as the attractive or repulsive interaction between any two charged objects in an electric field.

The electric field is investigated by measuring the force on a small positive test charge. This charge is so small that it does not significantly alter the field after testing.

An object having a greater electric charge will exert a greater force on an object than an object having a smaller electric charge.

Hence the electric force is directly proportional to the amount of Charge.

Answer:

The answer is Resistance

Answer:

Resistance

Explanation:

it opposes the flow of energy