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3 years ago

How much time will it take a 75w ceiling fan to convert 1500j of electrical energy into mechanical and thermal energy?

Physics

1 answer:

-Dominant- [34]3 years ago

4 0

20h

Explanation:

Given parameters:

Electrical power = 75W

Electrical energy = 1500J

Unknown:

Time taken = ?

Solution:

Electrical power is the amount of voltage that drives current.

P = IV

Electrical energy is the voltage that drives a current per unit of time

E = IVt

E = Pt

Since time is the unknown, we can make it subject of the formula;

t = $\frac{E }{P}$ = $\frac{1500}{75}$ = 20h

Learn more:

Invention of electrical power brainly.com/question/13146914

#learnwithBrainly

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A small metal sphere has a mass of 0.11 g and a charge of -21.0 nC . It is 10 cm directly above an identical sphere with the sam

GrogVix [38]

Answer:

A. the magnitude of the force between the spheres is 3.97 x 10⁻⁴ N

B. the magnitude of its initial acceleration is 5.83 m/s²

Explanation:

given information:

metal sphere's mass, m = 0.1 g = 1 x 10⁻⁴ kg

charge, q = -21 nC = -2.1 x 10⁻⁸

r = 10 cm = 0.1 m

What is the magnitude of the force between the spheres?

F₁₂ = k q₁q₂/r²

= ( 9 x 10⁹) (-2.1 x 10⁻⁸)²/(0.1)²

= 3.97 x 10⁻⁴ N

If the upper sphere is released, it will begin to fall. What is the magnitude of its initial acceleration?

mg - F₁₂ = ma

a = g - (F₁₂/m)

= 9.8 - (3.97 x 10⁻⁴/1 x 10⁻⁴)

= 5.83 m/s²

5 0

3 years ago

Complex matching suggests that individuals who have formed a relationship may differ predominantly in the area of __________.

jek_recluse [69]

Answer:

physical attractiveness

Explanation:

7 0

3 years ago

A CD has an initial angular speed of 600 rpm. If the disc stop rotating after 4 seconds, what is its angular acceleration?

Elza [17]

Answer:

-15.708 rad/s^2

Explanation:

First, let us covert everything to the same unit. For me, I find dealing with radians/sec more intuitive, but you can solve it in rpm. We are told that the initial angular speed is 600 rpm and after 4 seconds it stops. Let's convert 600 rpm into radians/sec. To do this, multiply by 2*pi/60. This gives 62.83 rad/s. Now let's review our info:

$\omega_i = 600rpm = 62.83rad/s\\\omega_f = 0\\t = 4s\\\alpha = ?$

Now we look up angular kinematics equations and the equation that has these parameters is

$\omega=\omega_0+\alpha t$

Substitute our values in:

$\omega=\omega_0+\alpha t\\0=62.83\frac{rad}{s}+\alpha *(4s)\\\alpha = -15.708\frac{rad}{s^2}$

5 0

3 years ago

A small plastic ball with a mass of 7.10 x 10⁻³ kg and with a charge of +0.161 µC is suspended from an insulating thread and han

GuDViN [60]

Answer:

$3.16097\times 10^{-8}\ C$

Explanation:

T = Tension on the string

E = Electric field

$\epsilon_0$ = Permittivity of free space = $8.85\times 10^{-12}\ F/m$

As the forces balance themselves we have the equations

$Tcos30=mg$

$Tsin30=Eq$

Dividing the equations we get

$tan30=\dfrac{Eq}{mg}\\\Rightarrow E=\dfrac{mgtan30}{q}\\\Rightarrow E=\dfrac{7.1\times 10^{-3}\times 9.81tan30}{0.161\times 10^{-6}}\\\Rightarrow E=249770.33291\ N/C$

Electric field is given by

$E=\dfrac{Q}{A\epsilon}\\\Rightarrow Q=EA\epsilon\\\Rightarrow Q=249770.33291\times 0.0143\times 8.85\times 10^{-12}\\\Rightarrow Q=3.16097\times 10^{-8}\ C$

The magnitude of the charge on each plate is $3.16097\times 10^{-8}\ C$

6 0

3 years ago

A dart hits a dartboard and stops in 0.060 s. The net force on the dart is 14 N during the collision.

Rainbow [258]

Answer:

<em>The change of momentum of the dart is 0.84 Nw.s</em>

Explanation:

<u>Impulse and change of momentum</u>

The change in momentum of an object is its mass times the change in its velocity:

$\Delta p=m\Delta v=m(v_2-v_1)$

The change in the momentum can also be found by considering the force acting on it. If a force F acts for a time Δt, the change of momentum is given by:

$\Delta p=F.\Delta t$

The dart hits a dashboard with a net force of 14 N during the collision and stops in 0.06 seconds. The change of momentum is:

$\Delta p=14*0.06=0.84$

The change of momentum of the dart is 0.84 Nw.s

5 0

3 years ago