What is capacitance?

Answers

Answer 1

Answer: Ability of a system to store an electric charge!

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An Earth satellite in orbit emits a radio signal of constant frequency. Compared to the emitted frequency, the frequency of the signal received by a stationary observer will appear to be:a) higher as the satellite approachesb) higher as the satellite moves awayc) lower as the satellite approachesd) unaffected by the satellite's motion
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Which statement best describes the kinetic theory of matter? Question 7 options: A. Matter is made up of particles that are in constant motion and have energy B. Matter is made up of particles that seldom move and do not possess energy C. Matter is made up of electrons that are in constant motion and have energy D. Matter is made up of particles that vibrate but do not possess energy E. Matter is made up of particles that seldom move and do possess energy

A body with a mass of 2,000 kg is lifted to a height of 15 m within a time of 15 s. Which one of the following statements concerning the action is true?a. The gravity force on the body is 294,000 N.
b. The potential energy of the body is 30,000 J.
c. The amount of work is 450,000 J.
d. The power exerted is 19,600 W.

Answers

So we want to know which statement is true for the body of mass m=2000kg that is lifted to a height of h=15m in t=15 s. Lets calculate each of the following: Gravity force on the body is F=m*g=2000*9.81=19620 N so a is FALSE. Potential energy of the body when it is lifted to the height of 15 m is Ep=m*g*h=2000*9.81*15=294300 J so b is FALSE. Work to lift the body is: W=Fg*h=2000*9.81*15= Ep=294300 J so c is FALSE. Power P=W/t=294300/15=19620 W So d is TRUE.

What is the resistance of an object to moving or to stoppingA. Gravity

B. Inertia

C. Gravitational Force

Answers

Inertia is the resistance of an object to moving or stopping

i believe the answer is C

What happens when the temperature of a substance is slightly decreased?

Answers

Answer: kinetic energy will reduce

Explanation: kinetic energy is a function of temperature the higher the temperature the more the kinetic energy of the molecules in the substance

The lower the temperature the lower the kinetic energy

If the temperature decreases, the molecules within the substance will move slowly and if the temperature is extremely decreased the substance will freeze.

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A person looks at a gem stone using a converging lens with a focal length of 12.5 cm. The lens forms a virtual image 30.0 cm from the lens. Determine the magnification. Is the image upright or inverted?

Answers

THE MAGNIFICATION FROM THE GEMSTONE WILL HAVE 3.4 MAGNIFICATION. THE IMAGE WILL BE PRODUCE UPRIGHT.

Explanation:

WE WILL USE FORMULA ,

$(1)/(f)$ = $(1)/(p) + (1)/(q)$

where q = -30.0 cm

f = 12.5 cm

so, $p =(1)/(f)-(1)/(q)$ )⁻¹

$=(1)/(12.5cm)-(1)/(-30 cm)$ )⁻¹

= 8.82353 cm

m= $(-q)/(p)$

= $-((-30)/(8.82353))$

m= 3.4

so the magnification will be 3.4 which is upright image as magnification is positive.

As a person looks at gem stone using converging lens with focal length of 12.5 cm and virtual image 30 cm from lens the magnification for such will be 3.4 .And the image will be upright.

Final answer:

For the case of a gem being observed through a converging lens, creating a virtual image located from the lens, the magnification would be greater than 1 and positive, suggesting an upright and magnified image.

Explanation:

In the given scenario, the gem stone is being observed through a converging lens with a focal length of 12.5 cm, and a virtual image is forming 30.0 cm from the lens. To find the magnification, which is a measure of how much larger or smaller the image is relative to the object, we use the formula for magnification in lens theory: Magnification (m) = - Image Distance (di) / Object Distance (do). Since we're dealing with a virtual image, the image distance is a negative value (-30.0 cm).

However, we are not given the object distance (do). In the context of magnifiers and conjugate rays, and taking into account that our image is virtual, we can assume that the value of the object distance (do) is less than the value of the focal length (12.5 cm) for this so-called 'Case 2' image. Therefore, we can say that the magnification (m) is greater than 1 and positive, which indicates that the image of the gem stone is upright and magnified (larger than the object).

Learn more about Lens Theory here:

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A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work?

Answers

Not sure what the given options are, but the answer is the horizontal component. This is given by Force x cos(angle), or Fcos(θ), where θ is the angle. In this case that would be 20cos(30) = 17.32N

you apply the same amount of heat to five grams of water and five grams of aluminum the temperature of the aluminum increases more than the temp of the water what can you conculde

Answers

Answer:

As we know that heat given to a substance is given by the formula as

$Q = m C\Delta T$

now we know that

$\Delta T = (Q)/(m C)$

now we know that aluminium and water both are of same mass and both are given same amount of heat so the value of Q and m will be same.

So here we can say that change in temperature depends inversely on the specific heat capacity.

So here if more specific heat capacity then there will be less change in temperature.

so we can conclude that since temperature of aluminium increases more so the specific heat capacity of aluminium will be less than that of water.

I can conclude that the aluminum heats up faster then the water, since how they are made up is more different, each has a different compound to it, plus water is more denser

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