PHYSICS HIGH SCHOOL

PLEASE HELP ME!If the mass of one object is tripled, and the distance between them is doubled, how does the force of gravity change?
a. Force is multiplied by 4
b. Force is divided 3
c. Force is multiplied 3/4
d. Force is divided 3/4

Answers

Answer 1
Answer: Force between two object is given by F = Gm1m2/r^2
If the mass of one object is tripled, and the distance between them is doubled,
then F(new) = Gm13m2/(2r)^2 = 3Gm1m2/4r^2 = 3/4 x Gm1m2/r^2 = 3/4 x F
i.e. F(new) = 3/4 multiplied by F.
Therefore, Force is multiplied by 3/4.

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A 4kg block sitting on the floor, how much potential energy does it have?

Answers


Well, there you have a very important principle wrapped up in that question.

There's actually no such thing as a real, actual amount of potential energy.
There's only potential relative to some place.  It's the work you have to do
to lift the object from that reference place to wherever it is now.  It's also
the kinetic energy the object would have if it fell down to the reference place
from where it is now.

Here's the formula for potential energy:    PE = (mass) x (gravity) x (height) .

So naturally, when you use that formula, you need to decide "height above what ?"

If you're reading a book while you're flying in a passenger jet, the book's PE is
(M x G x 0 meters) relative to your lap, (M x G x 1 meter) relative to the floor of the
plane, (M x G x 10,000 meters) relative to the ground, and maybe (M x G x 25,000 meters)
relative to the bottom of the ocean.

Let's say that gravity is 9.8 m/s² .

Then a 4kg block sitting on the floor has (39.2 x 0 meters) PE relative to the floor
it's sitting on, also (39.2 x 3 meters) relative to the floor that's one floor downstairs,
also (39.2 x 30 meters) relative to 10 floors downstairs, and if it's on the top floor of
the Amoco/Aon Center in Chicago, maybe (39.2 x 345 meters) relative to the floor
in the coffee shop that's off the lobby on the ground floor. 

P.E.=mgh

P.E.= mass×gravity×height, therefore 4kg×10×0= 0 J

K.E. is also equal to 0 because the block is not moving, is in the state of Inertia

What is Newtons second law of motion?

Answers

The acceleration of an objection is directly proportional to the magnitude of the net force, in the same direction of the net force, and inversely proportional to the mass.

Hello there!

Explanation:

↓↓↓↓↓↓↓↓↓↓↓↓↓↓

Newton's second law of motion states that the total net force acting on an object is equal to mass times acceleration.

Newton's second law of motion formula:

↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

F=force=newtons=kg*(m)/(s^2)

M=mass (kg)

A-acceleration ((m)/(s^2))

F=ma

M=f/a

A=f/m

For example:

↓↓↓↓↓↓↓↓↓↓↓

Calculate the force needed to accelerate an object to 4.3 m/s². The object has a mass of 2.2 kg. Round the answer to the nearest tenth.

↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

A= 4.3 m/s²

M= 2.2 kg

F=??

F=ma

2.2 kg (4.3 m/s²)=9.46=9.5N

Answer⇒⇒⇒⇒⇒9.5N

Hope this helps!

Thank you for posting your question at here on Brainly.

Have a great day!

-Charlie

Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.3 MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.3 cm and is 0.20 mm thick.Part AWhat is the resistivity of the leaf tissue?Express your answer to two significant figures and include the appropriate units.ρ=________Part BIs this greater than or less than the resistivity of muscle tissue in the human body?(A) greater or(B) less

Answers

Answer:

Part a)

\rho = 52.9 ohm- m

Part b)

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

Explanation:

Part a)

As we know the formula of resistance is given as

R = \rho (L)/(A)

here we know that

\rho = (RA)/(L)

here we have

R = 2.3 M ohm

L = 20 cm

Area = (0.023)(0.20 * 10^(-3))

Area = 4.6 * 10^(-6) m^2

now we have

\rho = ((2.3 * 10^6)(4.6 * 10^(-6)))/(0.20)

\rho = 52.9 ohm- m

Part b)

Resistivity of mucle tissue of human is is ranging from 15 ohm-m to 50 ohm m so here we can say that

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

A group of physics teachers is taking some time off for a little putt-putt golf. The 15th hold has a large metal rim that putters must use to guide their ball towards the hole. Mr S guides a golf ball around the metal rim. When the ball leaves the rim, which path (1,2 & 3) will the golf ball follow and why?

Answers


Call me nuts, but I can't shake the feeling that there's some kind of a
picture or drawing that's part of this question.  Unless I miss my guess,
you copied part of the question, and then decided to stop right there and
not let us see the picture.  If my hunch plays out, then we NEED to see
the picture in order to answer the question, and since you haven't shared
it, there is no way to write an answer.

Answer the following question about the attached diagram:1) Will the image form at A or B?

2) Will the image be erect or inverted?

3) Will the image be enlarged, diminished, or the same size?

4) What kind of mirror is this?

Answers

Answer:

1) Image is formed at B

2) The image is an inverted real image

3) The image is a diminished image

4) The mirror is a concave mirror.

Explanation:

According to the diagram, object placed at this point in front of the curved mirror (concave) is placed beyond the center of curvature of the mirror.

To form images by an object placed in front of a curved mirror, ray diagrams are used.

According to the diagram, the first ray from the object incidented on the mirror and parallel to the principal axis converges at the focus (f) after reflection. The second incident ray pass through the focus and then reflect back with reflected ray parallel to the principal axis.

The two reflected ray intersects back at a point B according to the diagram and the image will be formed at that point B with the image head pointing towards the point of intersection.

According to the diagram above, the image will be formed at B and the nature of the image will be inverted, real, diminished (smaller than the object) and formed between the center of curvature and the focus of the mirror.

The mirror in the diagram is a concave mirror since the plane surface of the mirror is bent inwards.
I'm not entirely sure, but I think the first is A, and the second is inverted.

Ruff, the 50 cm tall Labrador Retriever stands 3 m from a plane mirror and looks at his image. What is Ruff’s image position and height?

Answers

Since the mirror is plane, the image will be formed behind the mirror. The distance will be the same as that of the distance of the object from the mirror and the height will just be the same.
So, Ruff's image will be 3 m behind the mirror and 50 cm tall.
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