Derive a relation between Universal Gravitational Constant (G) and Acceleration due to gravity(g)?

Answers

Answer 1
Answer: suppose earth is a soid sphere which will attract the body towards its centre.So, acc. to law of gravitation force on the body will be,
F=G*m1m2/R^2
but we now that F=ma
and here accleration(a)=accleration due to gravity(g),so
force applied by earth on will also be mg
replace above F in formula by mg and solve,
F=G*mE*m/R^2                             ( here mE is mass of earth and m is mass of body)
mg=G*mEm/R^2
so,
g =G*mE/R^2




Answer 2
Answer: suppose earth is a soid sphere which will attract the body towards its centre.So, acc. to law of gravitation force on the body will be,
F=G*m1m2/R^2
but we now that F=ma
and here accleration(a)=accleration due to gravity(g),so
force applied by earth on will also be mg
replace above F in formula by mg and solve,
F=G*mE*m/R^2                             ( here mE is mass of earth and m is mass of body)
mg=G*mEm/R^2
so,
g =G*mE/R^2


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If a car travels 30.0 mi. north for 30.0 min., 50.0 mi. east for 1.00 hour, and 30.0 mi. south for 30.0 min., what is the average speed of the car over the total trip

Answers

Speed = (total distance covered) / (time to cover the distance) .

The direction at any time during the trip doesn't matter.

This car traveled  (30mi + 50mi + 30mi) = 110 miles .

The trip took  (30min + 60min + 30min) = 120 minutes

The average speed for the trip was

                           (110 miles) / (120 minutes)

                      =    (110 miles) / (2 hours)

                      =              55 miles/hour  .

Answer:

the answer is 55 mph

Explanation:

hope this helped

A quarter is 2.4 millimeters thick. How tall are the following stacks of quarters?a. A stack worth 50 cents
b. A stack worth $1
c. A stack worth $5
d. A stack worth $1,000
(Give your answer in millimeters and meters.)

Answers

A. 4.8 millimeters
B. 9.6 millimeters
C. 48 millimeters
D. 9,600 millimeters or 9.6 meters
There are 1000 mm in a meter

Which scientist would best describe the motion of the earth?Ptolemy
Brahe
Kepler
Newton

Answers

Answer:

Newton

Explanation:

Ptolemy usually talked about "Earth-centered," or "geocentric" theory that all celestial objects — including the planets, Sun, Moon, and stars — orbited Earth. Earth, in the center of the universe, did not move at all and obviously this theory has been proven wrong.

Brahe model had all the planets (except Earth) orbiting around the Sun, but then the Sun orbited around the Earth. This is also a wrong concept.

Kepler's Laws are mostly based upon the Planetary Motion and are incomplete is some areas.

Only Newton law best describes the motion of all planets where he says that all motion, whether it was the orbit of the Moon around the Earth or an apple falling from a tree, followed the same basic principles.

Newton has the theory

The work done in lifting an apple one meternear Earth’s surface is approximately
(1) 1 J (3) 100 J
(2) 0.01 J (4) 1000 J

Answers

Answer: Option 1: 1 J

Explanation:

Average mass of an apple is between 60 g to 200 g It is not greater than this.

We can take an average mass, m =130 g

This average mass approximation would not affect the final answer.

The work done in lifting any object is given by:

W = m g h

Where, m is the mass of the object, g is the acceleration due to gravity and h is the height to which the object is lifted.

It is given that, h = 1 m

g = 9.8 m/s²

m = 130 g = 0.13 kg

⇒W =0.13 kg×9.8 m/s²×1 m = 1.3 J ≈ 1 J

Thus, the work done in lifting an apple one meter  near Earth’s surface is approximately 1 J

If we take an apple of mass 0.1Kg, assuming that the gravitational acceleration is g=10m/s^2, we get W=1*0.1*10=\boxed{1J}

How is wave velocity calculated?

Answers

Velocity of a wave (v) = frequency (f) × wavelength (λ)As mentioned above, the velocity of a wave is related with its frequency and wavelength by the following equation. In order to find the velocity of sound using this equation, we need to know both the frequency and the wavelength of sound.

A device that conveys information with analog signals and digital signals is called _____.a) an electron device

b) an electrical device

c) an electric device

d) an electronic device

Answers

I believe the correct answer from the choices listed above is option D. A device that conveys information with analog signals and digital signals is called an electronic device. They are components for controlling the flow of electrical currents for the purpose of information processing and system control.
the correct answer is D