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4 years ago

Which of thWhich of the following is a true statement?

Physics

2 answers:

Mars2501 [29]4 years ago

8 0

Answer:

B. Both electric fields and forces decrease in strength as the distance increases.

Explanation:

from the Coulomb's law

$F=\frac{k q_{1} q_{2} }{r^{2}}$

electrif field is also expressed as

F = qE., so

$E = \frac{k q}{r^{2}}$

it can seen that electric force and electric field and dependent on distance. that is inverse square of distance.

so, if the electric force and eletric field decreases in strength, it is because the distance of separation has increased.

IgorC [24]4 years ago

7 0

Answer:

B. Both electric fields and forces ...

Explanation:

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NikAS [45]

Answer:

A) 350 N

B) 58.33 N

C) 35 kg

D) 35 kg

Explanation:

If we use that g = 10 m/s^2, then the acceleration of gravity on the Moon will be 10/6 m/s^2 = 5/3 m/s*2

The weight of the object on Earth is given by:

Weight = mass * g = 35 * 10 = 350 N

The weight of the object on the Moon:

Weight = mass * gmoon = 35 * 5/3 = 58.33 N

The mass of the object on Earth is 35 kg

The mass of the object on the Moon is exactly the same as on the Earth (35 kg) since the mass is a quantity inherent to the object and not to its location.

3 0

3 years ago

A satellite that goes around the earth once every 24 hours (86,400 s) is called a geosynchronous satellite. If a geosynchronous

Olegator [25]

Answer:

42244138.951 m

Explanation:

G = Gravitational constant = 6.667 × 10⁻¹¹ m³/kgs²

r = Radius of orbit from center of earth

M = Mass of Earth = 5.98 × 10²⁴ kg

m = Mass of Satellite

The satellite revolves around the Earth at a constant speed

Speed = Distance / Time

The distance is the perimeter of the orbit

$v=\frac{2\pi \times r}{24\times 3600}$

The Centripetal force of the satellite is balanced by the universal gravitational force

$m\frac{v^2}{r}=\frac{GMm}{r^2}\\\Rightarrow \frac{\left(\frac{2\pi \times r}{24\times 3600}\right)^2}{r}=\frac{6.667\times 10^{-11}\times 5.98\times 10^{24}}{r^2}\\\Rightarrow \left(\frac{2\pi \times r}{24\times 3600}\right)^2=6.667\times 10^{-11}\times 5.98\times 10^{24}\\\Rightarrow r^3=\frac{6.667\times 10^{-11}\times 5.98\times 10^{24}\times (24\times 3600)^2}{(2\pi)^2}\\\Rightarrow r=\left(\frac{6.667\times 10^{-11}\times 5.98\times 10^{24}\times (24\times 3600)^2}{(2\pi)^2}\right)^{\frac{1}{3}}\\\Rightarrow r=42244138.951\ m$

The radius as measured from the center of the Earth) of the orbit of a geosynchronous satellite that circles the earth is 42244138.951 m

6 0

3 years ago

Describe the principle of conversation of energy:

exis [7]

Answer: Energy can neither be created nor destroyed, rather it is converted from one form to another

Explanation:

The principle of conversation of energy explains how energy is conserved in nature by being converted from one form to another such that no energy is created nor destroyed.

Practical examples include:

- electrical pressing iron that converts electrical energy to heat energy

- solar panels that converts solar energy to electrical energy

- Car batteries that converts chemical energy to light energy etc

7 0

3 years ago

The North Star is located in the Big Dipper. True or False

harina [27]

Answer:

False

Explanation:

It is located in the little dipper whose stars are more faint.

4 0

3 years ago

Read 2 more answers

A digital signal differs from an analog signal because it a.consists of a current that changes smoothly. b. consists of a curren

zzz [600]

Answer:

d.it is used in electronic devices

7 0

3 years ago