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Y_Kistochka [10]

3 years ago

5

You are given the following problem: A simple circuit is made up of a 9 V battery and a 4.5 Ohm lightbulb. Determine the current

in the circuit. List the variables in this problem

1 answer:

finlep [7]3 years ago

5 0

Answer:

2 A

Explanation:

I = V/ R

= 9 / 4.5

= 2 A

I am writing this because the explanation must be 20 characters

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The design of a 60.0 cm industrial turntable requires that it has a kinetic energy of 0.250 j when turning at 45.0 rpm. What mus

Aneli [31]

Answer:

The moment of inertia of the turntable about the rotation axis is 0.0225 kg.m²

Explanation:

Given;

radius of the turnable, r = 60 cm = 0.6 m

rotational kinetic energy, E = 0.25 J

angular speed of the turnable, ω = 45 rpm

The rotational kinetic energy is given as;

$E_{rot} = \frac{1}{2} I \omega ^2$

where;

I is the moment of inertia about the axis of rotation

ω is the angular speed in rad/s

$\omega = 45 \frac{rev}{\min} \times \frac{2 \pi \ rad}{1 \ rev} \times \frac{1 \ \min}{60 \ s} \\\\\omega = 4.712 \ rad/s$

$E = \frac{1}{2} I \omega ^2\\\\I = \frac{2E}{\omega ^2} \\\\I = \frac{2 \ \times \ 0.25}{(4.712)^2} \\\\I = 0.0225 \ kg.m^2$

Therefore, the moment of inertia of the turntable about the rotation axis is 0.0225 kg.m²

5 0

3 years ago

What is another name for constructive interference?

SOVA2 [1]

C I hope this help bud

4 0

3 years ago

Comment on whether or not the following label on a consumer product should be cause for concern: CAUTION: The mass of this produ

Levart [38]

Answer:

Yes, it should be.

4 0

4 years ago

A 77.0 kg woman slides down a 42.6 m long waterslide inclined at 42.3. at the bottom, she is moving 20.3 m/s.how much work did f

svlad2 [7]

Answer:

W = 21409.2 J

Explanation:

Given,

The mass of the woman, m = 77 Kg

The length of the water slide, S = 42.6 m

The inclination of the water slide, ∅ = 42.3

The constant velocity of the women sliding, 20.3 m/s

The kinetic friction of the sliding force is given by the formula

Fₓ = μₓ η

Where,

μₓ - coefficient of kinetic friction

η - normal force acting on the body

Since the water slide is inclined at an angle and the person is sliding with constant velocity. The coefficient of friction becomes,

μₓ = tan∅

And, η = mg cos∅

Therefore, the kinetic friction force becomes

Fₓ = tan∅ mg cos∅

Substituting the given values in the above equation

Fₓ = 0.9 x 77 x 9.8 x 0,74

= 502.56 N

The work done by the kinetic friction on the person

W = Fₓ · S

= 502.56 N x 42.6 m

= 21409.2 J

Hence, the work done by the friction on the woman is, W = 21409.2 J

8 0

3 years ago

A solar cell that transforms 300 J of light energy into 45 J of electrical energy and 255 J of wasted energy. whats the efficien

Setler [38]

Answer:

15%

Explanation:

Step one:

Given data

Energy source= 300J

Useful energy = 45J

Waste energy = 255J

Required

The efficiency of the solar system

Step two:

The efficiency is computed by factoring only the useful work and the energy source

Efficiency= 45/300*100

Efficiency= 0.15*100

Efficiency= 15%

3 0

3 years ago