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3 years ago

8. A meter reader determines that a business has used 5000 kW.h of energy in 4 months. If

Physics

1 answer:

ladessa [460]3 years ago

7 0

Answer:

ENERGY AND COST. One kllowatt hour is 1,000 watts of power for one hour of time. ... Determine power: P = V XI ... Calculate the total kilowatt hours used. ... If the electric costs are 150 per kWh, how much does it cost to run the refrigerator in ... 8. A room was lighted with three 100-watt bulbs for 5 hours per day. If the cost of.

Explanation:

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5. Two charged spheres are separated by

soldier1979 [14.2K]

Answer:C

Explanation:

3 0

4 years ago

A weightlifter raises a 200-kg barbell with an acceleration of 3 m/s^2. How much force does the weightlifter use to raise the ba

lesya692 [45]

F = mass x acceleration

We have mass = 200kg

and acceleration = 3 m/s^2 so...

F = (200)(3)

F = 600 N

4 0

3 years ago

Describe the relationship between amperage, voltage, and, as well as resstance.

Nikolay [14]

Answer:

$I=\frac{V}{R}$

Explanation:

Ohms law says that the current in the conductor between the two points is directly related or directly proportional to the voltage by keeping a proportionality of constant which is called resistance.

Mathematically Ohms law can be written as,

$I=\frac{V}{R}$

Here, I is the current measure in ampere or amperage, V is voltage measure in voltage and R is resistance measure in Ohm.

Now the relation between the amperage, voltage and resistance will be,

$I=\frac{V}{R}$

Amperage=Voltage/Resistance

5 0

4 years ago

S Two astronauts (Fig. P 11.55 ), each having a mass M , are connected by a rope of length d having negligible mass. They are is

jek_recluse [69]

The new rotational energy of the system(RE) = $mv^{2}$

How this is calculated?

Distance of each astronaut from centre of mass(m)=d/2

Moment of inertia of system

$I=m(\frac{d}{2} )^{2}+ m(\frac{d}{2} )^{2}\\ I =\frac{md^{2} }{2}$

Speed of astronauts=v

So, angular speed,ω = $\frac{v}{d/2}$

= $\frac{2v}{d}$

Rotational energy of system= $\frac{1}{2} I \omega^{2}$

where, ω= angular speed

$RE=\frac{1}{2} *\frac{md^{2} }{2}*(\frac{2v}{d})^{2} \\RE =mv^{2}$

What is rotational energy?

Rotational energy or angular kinetic energy is kinetic energy due to the rotation of an object and is part of its total kinetic energy.
Looking at rotational energy separately around an object's axis of rotation, the following dependence on the object's moment of inertia is observed

To know more about rotational energy , refer:

brainly.com/question/13623190

#SPJ4

7 0

2 years ago

A meteor is falling towards the earth. If the mass and the radius of the earth are 6×10^24kg and 6.4×10^3km respectively,find th

Klio2033 [76]

Answer:

h = 3600 km

Explanation:

Given,

The mass of the Earth, M = 6 x 10²⁴ km

The radius of the Earth, R = 6.4 x 10³ km

The acceleration of the meteor at height, x = 4 m/s²

The acceleration due to gravity at the surface of the Earth is given by the formula,

g = GM/R²

At height 'h' acceleration is given by the formula,

gₓ = GM/Rₓ²

Rₓ² = GM/gₓ

= 6.673 x 10⁻¹¹ X 6 x 10²⁴ / 4

= 1 x 10¹⁴

Rₓ = 1 x 10⁷ m

Where,

Rₓ = R + x

x = Rₓ - R

= 10000 km - 6400 km

= 3600 km

Hence, the height of the meteor where its acceleration due to gravity is 4 m/s² is, h = 3600 km

4 0

4 years ago