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3 years ago

Imagine you are the teacher of a science class. A student brings in a

Physics

1 answer:

Nimfa-mama [501]3 years ago

4 0

Answer: Running out of energy means that the magicians will break

Explanation:

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

tresset_1 [31]

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

7 0

3 years ago

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Mga tanong 1. Ano ang nangyari sa lobo? 2. Sa iyong palagay, saan napunta ang pumutok na lobo? 3. Kapag pumutok ang lobo ano ang

gavmur [86]

Answer:

1. Pumutok ang Lobo

2.basurahan

3.may kwentong po ba to paano ko masagot ng wala naman akong mababasang kwento :) :) :)

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3 years ago

Janice's mother often lets her 6-month-old baby sit in front of the television, watching episodes of Sesame Street. What is Jani

brilliants [131]

B.

The child is too old to be gaining something from the screen time.

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3 years ago

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

What is the chemical formula for copper (I) sulfide? A) CuS B) CuS2 C) Cu2S D) Cu2S3

Ganezh [65]

This problem can be solved by using oxidation states. The oxidation state is based on the electrons an atom loses or gain, or appears to use when forming compounds.To find the formula for Copper (I) Sulfide, we have to first consider the individual ions that come together to form it. Copper (I) is an ion of copper that has a charge of +1, i.e $Cu^{+}$ . Sulfur is an element in group 6 of the periodic table. The sulfur ion has a charge of -2, i.e $S^{2-}$ . To form Copper (I) Sulfide, which is electrically neutral, we need 2 Copper (I) ions and 1 sulfur ion.

$Cu_2S= 2Cu^+ 1S^-^2= 2(+1) + (-2) = 0$ .

The reaction is represented by the equation below

$2Cu^{+} +S^{2-}-->Cu_2S$ .

The correct answer is (C)

4 0

3 years ago

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