An electrical kettle uses 18A of current to boil 500ml of water. What is the electrical resistance of the kettle in ohms?

Answers

Answer 1

Answer:
We can't tell from the given information.

Regarding the water, we don't know . . .
-- starting temperature
-- quantity of water
-- time in which the heater boiled it
so we don't know how much heat energy it takes to boil it.

Even if we DID know the total heat energy required, we don't know
the voltage supplied to the kettle's heating coil. Together with the
current flowing in the heater, we need to know either its resistance
or the voltage across it in order to calculate the rate at which heat
energy is dissipated from the heater.

Related Questions

How can you increase the momentum of an object?
In a game of darts, the dart thrower releases the dart directly at the center of the target (the "bull’s eye") with a speed of 13.0 m/s, and the dart strikes the wall, 0.23 m directly below the center of the target. How far from the wall, along the x-axis, was the dart released?
How does size of an object affect its gravity
Which of these is an illuminated source of light? A. the sun B. a star C. the earth seen from the moon D. a meteorite as it burns up in the atmosphere ***ooh i don't know this one at all! thank you!!
Two pieces of flint rock produce a visible spark when they are struck together. During this process, mechanical energy is converted into

If you apply 100.0 N of force to lift an object with a single, fixed pulley, then what is the resistive force?

Answers

If you apply 100.0 N of force to lift an object with a single, fixed pulley, then the resistive force is also equivalent to 100 Newtons of force. Since the weight of the object was not mentioned, it is assumed that it has already been taken into account in the 100 N value of force. This follows Newton's law of motion of equal action and reaction.

What does the photoelectric effect prove?

Answers

The photoelectric effect is the process of producing electrons when light shines upon a certain material. The photoelectric effect proves that light is made up of particles or waves which means light has a wave-particle dual nature. Such nature is also present in electrons.

If a plane can travel 450 miles per hour with the wind and 410 miles per hour against the wind, find the speed of the plane without a wind and speed of the wind. I need help with this one :(

Answers

The speed of the plane without a wind is 430 miles/hr and speed of the wind is 20 miles/hr.

What is Speed ?

Speed is a rate of change of distance with respect to time. i.e. v=dx÷dt. Speed can also be defined as distance over time

i.e. speed= distance ÷ time

it is denoted by v and its SI unit is m/s. it is a scalar quantity.

Speed shows how much distance can be traveled in unit time.

To find dimension for speed is, from formula

Speed = Distance ÷ Time

Dimension for distance is [L¹] ,

Dimension for Time is [T¹],

Dividing dimension of distance by dimension of time gives,

{L¹] ÷ [T¹] = [L¹T⁻¹]

Dimension for speed is [L¹T⁻¹].

Consider,

Speed of the plane = v

Speed of the wind = u

Speed of the wind in the direction of wind is,

v + u = 450 miles/hr.....1

Speed of the wind in the opposite direction of wind is,

v - u = 410 miles/hr.....2

Adding equation 1 and 2

2v = 860

v = 430 miles/hr

Subtracting equation 1 and 2

2u = 40

u = 20 miles/hr

Hence the speed of the plane without a wind is 430 miles/hr and speed of the wind is 20 miles/hr.

To know more about Speed :

brainly.com/question/28224010

#SPJ2.

the plane is 430 and the wind it 20miles

On a large scale, matter is mostly neutral. What is true of electric forces on a large scale?a) They are exactly zero.

b) They are mostly negative.

c) They are close to zero.

d) They are mostly positive.

Answers

Answer: The correct option is (c).

Explanation:

The electric force exists between the charged particles only.

The electric force between the negatively or positively charged particles is attractive in nature while the electric force between the negative and the positive charged particles is repulsive in nature.

Matter consists of atoms. Atom consists of electrons, protons and neutrons. Only, electrons can move. If the atom loses electrons then matter gets negatively and positively charge respectively.

In the given problem, the matter is mostly neutral on a large scale. On a large scale, the electric forces are close to zero.

Therefore, the correct answer is (c).

c) They are close to zero.

Which of the following actions or events did not contribute to the Dust Bowl? Farmers in the Central U.S. had plowed grasslands to grow food crops to feed the increasing human population. They left the fields plowed and bare in the winter months when crops were not grown, and this left the soil exposed to wind. A long drought in the 1930s left the exposed soil especially dry due to the lack of precipitation. With the advent of pesticides, minerals in the ground were leached.

Answers

The following cause that is notconsidered in the formation of a Dust Bowl is the lack of farmers in Oklahoma.The answer is letter B. in fact, the number of farmers increases due to thehigh grain prices of Worl War I that encourages farmers to plow millions ofacres of natural grass to plant wheat.

Answer:

With the advent of pesticides, minerals in the ground were leached.

Explanation:

got it right on odyssey

A car enters the freeway with a speed of 6.4 m/s and accelerates uniformly for 3.2 km in 3.5 min. How fast (in m/s) is the car moving after this time?