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3 years ago

I have no clue on how to do this

Physics

1 answer:

KatRina [158]3 years ago

3 0

a)5m/s b)5

the 5 is because you add the seconds to get 8 seconds and then do the same with the distance to get 40. 40/8 = 5. speed = 5

Velocity = displacement/change in time

V = 40/8

I just realized how unorganised my math looks but I hope this is helpfull

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At what distance (in m) is the electrostatic force between two electrons equal to the weight of one?

Ksivusya [100]

Answer:

Explanation:

Given

Electrostatic force between two electrons is equal to weight of one electron

i.e.

$\frac{kq_1q_2}{r^2}=m_e\cdot g$

where $q_1,q_2$ are the charge of particles

$m_e=$ mass of electron

r=distance between them

$\frac{9\times 10^{9}\times 1.6\times 10^{-19}\times 1.6\times 10^{-19}}{r^2}=9.11\times 10^{-31}\times 9.8$

$r=5.08\ m$

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3 years ago

A source of sound is kept in a jar in a vacuum. Air is slowly introduced in to the jar. What happens to the sound coming out of

timama [110]

<span>The loudness of the sound increases gradually as the air is slowly introduced in to the jar. This is because sound needs a physical medium and in a vacuum there is none. The air provides that medium and as it is introduced, the transfer of sound energy increases</span>

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3 years ago

According to ohms law if you don't change the value of the resistor and you double the voltage in a circuit the amount of curren

padilas [110]

Answer: D (doubled)

According to ohm's law

I = V/R ,

V = IR ; R = constant and V is doubled

From the equation

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4 years ago

Anakin Skywalker's pod racer has a mass of 450 kg. If the top speed of this racer is 947

andriy [413]

Answer:

15,569,653.3 Joules(J)

Explanation:

The equation used to find Kinetic Energy (KE) is

KE = $\frac{1}{2}$ m $v^{2}$

You have been given

m = 450kg

v = 947km/h

KE = ???

Firstly, we need to convert the km/h into m/s as this is the unit used in the KE equation

This can be done by dividing by 3.6

947km/h = 263.056m/s

Substitute you values into the equation

KE = $\frac{1}{2}$ m $v^{2}$

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KE = 15,569,653.3 Joules(J)

Round your answer as appropriate

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3 years ago

A box slides down a frictionless incline, gaining speed. The work done by the normal force n is _______.

jeka57 [31]

The work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.

<h3>What is normal force?</h3>

The force of contact is called the normal force. When the two surfaces are in contact with each other, then the normal force acts.

This force is applied by the solid bodies on each other in order to prevent the passing through each other.

A box slides down a frictionless incline, gaining speed. For this box, the value of work done by normal force has to be found out. Let's analyze the given condition.

The body is gaining the speed, which means there is a change in kinetic energy.
The change in kinetic energy is equal to the work done.
The friction force is the product of coefficient of the friction and normal force.
The friction force for the given case is zero. Thus, the normal force must be equal to the zero.

Thus, the work done by the normal force n when the box slides down a frictionless incline and gaining speed is zero.

Learn more about the normal force here;

brainly.com/question/10941832

7 0

2 years ago

Read 2 more answers