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4 years ago

11

force between two identical short bar magnets whose centres are part is 4.8 N when their axes are in same line. if this separati

on is increased to 2r metre the force between them is reduced to

1 answer:

77julia77 [94]4 years ago

5 0

There uyou go. hope this helps.

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Explain what the ionosphere is and how it interacts with some radio waves.

kumpel [21]

Answer:

Explained

Explanation:

Ionosphere is the outermost layer of the Earth's atmosphere,extending from 60 km to 1,000 km altitude.
It mainly consists of ionized gases by the solar radiation.
It is very important layer to Earth because it influences the radio propagation to distant places on Earth.
Being ionized it reflects high frequency(shortwave) radio waves to the sky as well as to the Earth by a technique called "skip" or "skywave" propagation for the communication over long distances.

7 0

3 years ago

A 2150 kg satellite used in a cellular telephone network is in a circular orbit at a height of 780 km above the surface of the e

Tom [10]

Answer:

a) $F=16741.9N$

b) $\frac{F}{W}=0.795$

Explanation:

The gravitational force on the satellite is calculated with Newton's Gravitation Law:

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

Where $M=5.97\times10^{24}kg$ is Earth's mass, $m=2150kg$ is the satellite mass, $r=R+h$ is the distance between their centers, where $h=780000m$ is the height of the satellite (from Earth's surface) and $R=6371000m$ is Earth's radius, and $G=6.67\times10^{-11}Nm^2/kg^2$ is the gravitational constant.

a) With these values we then have:

$F=\frac{GMm}{r^2}=\frac{(6.67\times10^{-11}Nm^2/kg^2)(5.97\times10^{24}kg)(2150kg)}{(6371000m+780000m)^2}=16741.9N$

b) And the fraction this force is of the satellite’s weight <em>W=mg</em> is:

$\frac{F}{W}=\frac{GMm}{mgr^2}=\frac{GM}{gr^2}=\frac{(6.67\times10^{-11}Nm^2/kg^2)(5.97\times10^{24}kg)}{(9.8m/s^2)(6371000m+780000m)^2}=0.795$

5 0

4 years ago

Two ping pong balls have been painted with metallic paint and charged by contact with an Van de Graaff generator. The charge on

andre [41]

Answer:

0.035 N

Explanation:

Parameters given:

Charge q1 = -3.31x10^(-7) C

Charge q2 = -5.7x10^(-7) C.

Distance between them, R = 22 cm = 0.22 m

Electrostatic force between to particles is given as:

F = (k* q1 * q2) / R²

F = (9 * 10^9 * -3.31 * 10^(-7) * -5.7 * 10^(-7)) / 0.22²

F = 0.035 N

6 0

3 years ago

Read 2 more answers

What acceleration will you give to a 27.8 kg

stich3 [128]

Answer:

2.72m/s²

Explanation:

Given parameters;

Mass of box = 27.8kg

Force on box = 75.7N

Unknown:

Acceleration = ?

Solution:

Force is the product of mass and acceleration;

Force = mass x acceleration

Now insert the parameters and solve;

75.7 = 27.8 x a

a = $\frac{75.7}{27.8}$ = 2.72m/s²

3 0

3 years ago

Which would be best categorized as heat transfer by convection?

pantera1 [17]

Answer:

B

Explanation:

there are three modes of heat transfer which are

conduction
convection
radiation

Conduction is a mode of heat transfer in solid materials

Convection refers to a mode of heat transfer of fluids in motion.

Radiation occurs when heat moves as energy waves in form of infrared radiation. The energy from the sun reaches us by radiation.

From the list of options;

option A refers prevention of heat transfer by radiation

option B refers to noodles rising and falling in a poy of boiling water. The path which the noodles move shows the convective path of the fluid.

option C refers to heat transfer by conduction

Option D refers to oth convection and radiation as modes of heat transfer.

option B best describes heat transfer by convection

6 0

3 years ago