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3 years ago

A moving electric charge is surrounded by:

Physics

1 answer:

kaheart [24]3 years ago

5 0

Answer:

both an electric field and a magnetic field

Explanation:

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A merry-go-round consists of a uniform solid disc of 225kg and a radius of 6.0m. A single 80kg person stands on the edge when it

Rashid [163]

Answer:

Angular speed of the disc becomes 0.305 rev/s

Explanation:

As we know that there is no torque on the system of disc and the person

so we can use angular momentum conservation

here we will have

$I_1\omega_1 = I_2\omega_2$

so we have

$I_1 = \frac{1}{2}MR^2 + mR^2$

$I_1 = \frac{1}{2}(225)(6^2) + 80(6^2)$

$I_1 = 6930 kg m^2$

now when man moves towards the center by distance 3.5 m

$I_2 = \frac{1}{2}MR^2 + mr^2$

r = 6 - 3.5 = 2.5 m

$I_2 = \frac{1}{2}(225)(6^2) + (80)(2.5^2)$

$I_2 = 4550 kg m^2$

now we have

$6930 \times 0.20 = 4550 (\omega)$

$\omega = 0.305 rev/s$

6 0

2 years ago

An example of hydro energy is

Tju [1.3M]

An example of hydro energy is: C. a hydroelectric dam.

6 0

3 years ago

An elevator of mass M is at rest when its cable breaks. The elevator falls a distance h before it encounters a massless, cushion

brilliants [131]

Answer: $v=\sqrt{\dfrac{2[mgh+fh]}{m}}$

Explanation:

$\text{Given}$

cable breaks and elevator falls a distance h

Friction force f is applied by the clamps

Before it hits the spring velocity of elevator is given by the work energy theorem i.e. work done by all the forces is equal to change in kinetic energy

$W_g+W_f=\text{change in kinetic energy}$

Where ,

$W_g=\text{Work done by gravity}$

$W_f=\text{Work done by friction}$

$mgh+f\cdot h=\frac{1}{2}mv^2$

$v=\sqrt{\dfrac{2[mgh+fh]}{m}}$

6 0

2 years ago

What is the energy put into a machine or device to make it work

Neporo4naja [7]

Answer:

The energy put into a machine or device to make it work is named work input.

Explanation:

Machines are devices to perform tasks with less effort or more easily. They can either increase the force applied or change the direction of the force or permit to apply the force at a distance.

The law of conservation of energy states that the energy is neither created nor destroyed, but when the machines do work some energy is dissipated in the form of heat, light or sound, due, mainly to friction.

In consequence, the work output is less than the work input.

A measure of energy use is efficiency. The efficiency is the ratio of the work output to the work input.

$Efficiency=\dfrac{\text{Work done by the machine}}{\text{Work done on the machine}}$

4 0

2 years ago

Read the scientific question below.

timofeeve [1]

It would be the last one. because adding fertilizers to the soil, makes the soil rich for a plant to grow "healthy"

7 0

2 years ago

Read 2 more answers