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3 years ago

Define what is physics

2 answers:

5 0

In my own words, I would say that physics is an area of science that seeks to explain and understand the fundamental nature of the dynamics of objects, essentially defining how objects can interact, in space and in time.

mario62 [17]3 years ago

5 0

Physics is a branch of science that deals with the structure of matter and the fundamental constituents of the universe interact. It’s motion, and behaviour through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and it’s main goal is to understand how the universe behaves.

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Which of the following is the correctly abbreviated SI unit describing the mass of an object?

Aloiza [94]

The correct answer would be kg!

6 0

3 years ago

What is da answer please i need help

jolli1 [7]

Answer:

Air and water i think

Explanation:

Cause Air =25% and water=25% so that equals 50%

8 0

3 years ago

The Global Positioning System (GPS) is a constellation of about 24 artificial satellites. The GPS satellites are uniformly distr

Liono4ka [1.6K]

Answer:

b) 3.72m/s²

c) 9.33*10^5

d) 9.33*10^5

e) 11.85 hrs

Explanation:

a) to confirm that gEarth is about 98 m/s².

Let's use the formula:

$gEarth= \frac{G*M}{R^2}$

$= \frac{6.67*10^-^1^1*5.972*10^2^4}{(6378*10^3)^2}$

= 9.78 m/s²

=> 9.8m/s²

b) Given:

$m = 6.417*10^2^3$

r = 2106 miles

$g_Mars = \frac{G*M}{R^2}$

$= \frac{6.67*10^-^1^1*6.417*10^2^3}{(2106*1.61*10^3)^2}$

=3.72 m/s²

c) we use:

$F = \frac{G*M*m}{R^2}$

$=\frac{6.67*10^-^1^1*5.972*10^2^4*1630*10^3}{((20000+6378)*10^3)^2}$

$= 9.33*10^5 N$

d) Let's take the force of gravitybon earth due to satellite as our answer in (c) because the Earth's gravitational force on a GPS satellite and the force of gravity on a GPS satellite on earth are equal and opposite (two mutual forces).

$F = 9.33*10^5 N$

e) In a circular motion,

Gravitional force = Centripetal force.

$\frac{GM*m}{R^2}=\frac{m*v^2}{R}$

$\frac{GM}{R}= v^2$

Solving for v, we have

$v= \sqrt{\frac{6*67*10^-^1^1*5.972*10^2^4}{(20000+6278)*10^3}}$

v = 3886m/s

Therefore,

v = 2πR/T

$3886 = \frac{2*pi*(20000+6378)*10^3}{T}$

Solving for T, we have:

T = 42650seconds

Convert T to hours

T = 42650/60*60

T = 11.86hrs

6 0

4 years ago

why does earth orbit the sun rather than any other body in the solar system? a) the mutual repulsions among all the planets hold

ElenaW [278]

Answer: c) the sun is the most massive object; gravitational attraction is related to mass.

Explanation:

Gravitational pull exists between any two objects having mass.

$F =\frac{GMm}{r^2}$

where symbols have their usual meaning.

All the planets including Earth revolve around the Sun because its the most massive object in the neighborhood and thus has high gravitational pull. This gravitational pull of Sun keeps the Earth in its orbit around it.

Hence, the correct answer is earth orbit the sun rather than any other body in the solar system because c) the sun is the most massive object; gravitational attraction is related to mass.

5 0

4 years ago

Read 2 more answers

Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts

wolverine [178]

Answer:

0.304 m/s2

Explanation:

If the first child is pushing with a force of 69N to the right and the 2nd child is pushing with a force of 91N to the left. Then the net pushing force is 91 - 69 = 22 N to the left. Subtracted by 15N friction force then the system of interest is subjected to F = 7 N net force tot he left.

We can use Newton's 2nd law to calculate the net acceleration of the system

$a = F/m = 7 / 23 = 0.304 m/s^2$

5 0

3 years ago

Define what is physics​

Define what is physics