Emily’s vacuum cleaner has a power rating of 200 watts. If the vacuum cleaner does 360,000 joules of work,how long did Emily spend vacuuming?

Answers

Answer 1

Answer: Divide 360000 by 200 to get 1800 seconds, or half of hour.

Related Questions

A boat sails along the shore. To an observer, the boat appears to move at a speed of 11 m/s, and a man on the boat walking forward appears to have a speed of 12.4 m/s. How long does it take the man to move 6 m relative to the boat?
Safety belts protect people in cars in the event of an accident because, according to Newton’s laws of motion, when an impact causes the car to suddenly change its motion -A.the speed of the people always increases, since now they have not one but two forces acting on them.B.the speed of the car always increases, giving it greater force since the mass will remain the same.C.the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.D.the people in the car will continue to move in the same direction and at the same speed as before the impact.
In a stringed musical instrument, the sound frequency of a particular string can be increased by A. tightening the string.B. increasing the string's thickness.C. loosening the string.D. lengthening the string.
the four forces shown have the same strength. which force would be most effective in opening the door?
What is the main difference between a longitudinal wave and a transverse wave? a longitudinal wave travels faster than a transverse wave. a transverse wave always has a larger amplitude than a longitudinal wave. the motion of the medium is parallel to a longitudinal wave and perpendicular to a transverse wave. the frequency is directly proportional to wavelength in a longitudinal wave but inversely proportional in a transverse wave.?

An electric heater operating at 120. volts draws8.00 amperes of current through its 15.0 ohms of
resistance. The total amount of heat energy
produced by the heater in 60.0 seconds is
(1) 7.20 × 10^3 J (3) 8.64 × 10^4 J
(2) 5.76 × 10^4 J (4) 6.91 × 10^6 J

Answers

Ohm's law :

V = IR

The amount of work done is

P = IV or P = I^2R (using Ohm's law to substitute)

Therefore,

P = 64*15

= 960W

So the total energy released is

Pt = 960*60

= 57600J

What is ohm's law ?

"Ohm's law states the relationship between electric current and potential difference. It states that the current that flows through most conductors is directly proportional to the voltage applied to it."

The strength of a direct current is directly proportional to the potential difference and inversely proportional to the resistance of the circuit.

What is work done?

Work done : W = (|F| cosθ) |d|

"Work done is defined as the multiplication of magnitude of displacement d and the component of the force that is in the direction of displacement."

Know more about ohms law here

brainly.com/question/12372387

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Ohms law says that V = IR
The amount of work done is P = IV or P = I^2R (using Ohm's law to substitute)
Therefore P = 64*15 = 960W
So the total energy released is Pt = 960*60 = 57600J

A small plastic sphere with a charge of -6.0 nC is near another small plastic sphere with a charge of -14 nC . If the spheres repel one another with a force of magnitude 8.3×10−4 N , what is the distance between the spheres?

Answers

Here is how to answer the question.

Use the formula:
F = kq1q2/r^2

F = force = 8.3x10^-4N
q1, q2 = charges
r = separatioon
k = constant = 9x10^9 in MKS units

so we have

r = sqrt[k q1 q2/F]
r = sqrt[9x10^9*(-14)x10^-9 * (-6)x10^-9 / 8.3x10^-4 ]
r = 0.0302 m

So the distance between spheres is 0.0302 m

Tierra is playing in her backyard when she hears her friend calling out to her. She can't see her friend but can hear her friend's voice. Which wave phenomenon helps explain why Tierra can hear her friend even when she can't see her?interference

refraction

superposition

diffraction

Answers

Answer : diffraction

Explanation : Diffraction is the phenomenon of bending of sound waves around the small openings or obstacles.

Tierra is playing in her backyard when she hears her friend calling out to her. Tierra can hear her friend even when she can't see her. This is because the sound is spreading out from the small openings and hence diffraction of sound wave occurs.

WaterWood
Neon gas
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement
A)
wood, water, neon gas
B)
wood, neon gas, water
water, wood, neon gas
D
water, neon gas, wood

Answers

Answer:

I think the correct answer from the choices listed above is option A. The correct arrangement of the substances according to the most to the least ordered particle arrangement should be wood, water and neon gas. Wood should be the first since it is solid which has the most ordered structure as compared to the liquid and a gas. The neon gas is the last since as a gas it has the least ordered structure.

Answer:

A) wood, water, neon gas

Explanation:

wood, water, neon gas.

The particles of solids have an arrangement that is highly ordered and regular. Liquids have an arrangement that is less ordered, and the particle arrangement in gases is the least ordered and regular of the three states of matter.

tell me if im wrong .... hope this helps :)

The statement that "The universe is the same everywhere and does not change over time" is known as _____.a. the cosmological principle
b. the perfect cosmological principle
c. the oscillating universe theory
d. the steady state theory

Answers

Answer: b. the perfect cosmological principle

Explanation:

The perfect cosmological principle is the extension of the cosmological principle. It states that the universe is homogeneous. It looks same from everywhere. It will look the same. It will never change over time instead of some of the gross changes occurring in the universe.

The answer is B- Perfect Cosmological Principle

Sorry it took people so long to anser:)

A device that does work with one movement and changes the size or direction of a force is a(n)

Answers

A device that does work with one movement and changes the size or direction of a force is a simple machine.

Answer:

it is a simple machine

Explanation:

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