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oee [108]
3 years ago
7

4. An electric toaster is rated at 500 watts. Determine the amount of electrical

Physics
1 answer:
hram777 [196]3 years ago
3 0

Answer:60000 joules

Explanation:

power=500watts

Time=2minutes=120seconds

Heat energy=power x time

Heat energy=500 x 120

Heat energy=60000J

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A 763 kg car moving at 26 m/s brakes to a stop. The brakes contain about 15 kg of iron that absorb the energy. What is increase
Neko [114]

Answer:

\Delta T=38.20^{\circ}

Explanation:

It is given that,

Mass of the car, m = 763 kg

Speed of the car, v = 26 m/s

Mass of the iron, m' = 15 kg

Specific heat of iron, c = 450 J/kg

When the car is in motion, it will possess kinetic energy. It is given by :

K=\dfrac{1}{2}mv^2

K=\dfrac{1}{2}\times 763\times (26)^2

K = 257894 J

Since, energy is absorbed by the brakes. The kinetic energy of the car is absorbed by the brakes. So,

K=mc\Delta T

\Delta T is the increase in temperature of the brakes

\Delta T=\dfrac{K}{m'c}

\Delta T=\dfrac{257894}{15\times 450}

\Delta T=38.20^{\circ}

So, the increase in temperature of the brakes is 38.20 degrees Celsius. Hence, this is the required solution.

3 0
3 years ago
A large piece of jewelry has a mass of 132.6 g. a graduated cylinder initially contains 48.6 ml water. when the jewelry is subme
Lerok [7]

The density of the substance is<u> 10.5 g/cm³.</u>

The jewelry is made out of <u>Silver.</u>

Density ρ is defined as the ratio of mass <em>m</em> of the substance to its volume V<em>. </em> The cylinder contains a volume <em>V₁ of water</em> and when the jewelry is immersed in it, the total volume of water and the jewelry is found to be V₂.

The volume <em>V</em> of the jewelry is given by,

V=V_2 -V_1

Substitute 48.6 ml for <em>V₁ </em>and 61.2 ml for V₂.

V=V_2 -V_1\\ =61.2 ml -48.6 ml\\ =12.6 ml

calculate the density ρ of the jewelry using the expression,

\rho =\frac{m}{V}

Substitute 132.6 g for <em>m</em> and 12.6 ml for <em>V</em>.

\rho =\frac{m}{V}\\ =\frac{132.6 g}{12.6 ml} \\ =10.5 g/ml

Since 1 ml=1 cm^3,

The density of the jewelry is <u> 10.5 g/cm³.</u>

From standard tables, it can be seen that the substance used to make the jewelry is <u>silver</u><em><u>, </u></em>which has a density 10.5 g/cm³.



4 0
3 years ago
Please Help!
loris [4]
There is a net force of 15N in The direction of Levi
6 0
3 years ago
Read 2 more answers
A volume of 25 milliliters is the same as a volume of ____________________ cubic centimeters.
PolarNik [594]

Answer:

25 cm³

Explanation:

In the conversion of units, we know that are one cubic centimeters (cm³) in a milliliter (mL) .

1 milliliter = 1 cubic centimeter

25 milliliters = 25 cubic centimeters

Therefore, a volume of 25 milliliters is the same as a volume of 25 cubic centimeters.

This ultimately implies that, the volume of an object in milliliters is equivalent to its volume in cubic centimeters.

6 0
3 years ago
1. Identify the significance of the following terms to the subject of the Civil War.
DanielleElmas [232]
What following terms I don’t see any please make your question clear
4 0
4 years ago
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