The statement, "Energy can neither be created nor destroyed, but can change from one form to another," is what law?

Answers

Answer 1

Answer: In chemical reaction, atomsalways are rearranged. They are never destroyed or created because it wouldcontradict the law of conservation of energy. The law of conservation of energystates that energy can neither be created nor destroyed, but can change fromone form to another. Also it cannot be neutralized. Resulting in one cannot bepart of a chemical reaction. An example of this is the reaction HCl + NaOH-> NaCl + H2O. the reactants and products are not created, they are justformed into another substance.

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Find the speed of sound in air that is 30.0°C.

350

314

18

Answers

Answer:

v = 350 m/s

Explanation:

The speed of sound depends on the temperature of surrounding. The relation between the speed of sound and the temperature is given by :

$v=331+0.61T$

Where, T is temperature in Celsius

Here, T = 30 degree Celsius

$v=331+0.61* 30$

v = 349.3 m/s

v = 350 m/s

Therefore, the speed of sound in air at 30 degrees Celsius is 350 m/s.

Answer:

the answer is 350 m/s

Explanation:

If a grocery cart with a mass of 16.5 kg accelerates at +2.31 m/s2 against a frictional force of -15.0 N, what is the applied force?

Answers

Call the applied force 'A'. (Clever ?)

The forces on the cart are 'A' forward and 15 N backward.

The net force on the art is (A-15) forward.

F = m a

Net forward force = (mass of the cart) x (its forward acceleration)

(A - 15) = (16.5) x (2.31)

A - 15 = 38.115

Add 15 to each side:

A = 53.115 newtons

2th Law of Newton:

$\vec{R}=m.a\n \n \vec{R}=\vec{F} -\vec{F_a}=m.a\n \n \vec{F}-15=16.5*2.31\n \n \vec{F}=38.115+15\n \n \boxed{\vec{F}=53.115 \ N}$

What is the polarity of each of the earths magnetic poles ? Explain you answer

Answers

Answer:

When you put un-like poles together (South facing North) you can feel magnetic attraction. In the Northern Hemisphere, your compass needle points North, but if you think about it for a moment, you will discover that the magnetic pole in the Earth's Northern Hemisphere has to be a South polarity.

In the mobile m1=0.42 kg and m2=0.47 kg. What must the unknown distance to the nearest tenth of a cm be if the masses are to be balanced? The answer is 13.4 In the mobile what is the value for m3 to the nearest hundredth of a kilogram?

Answers

Complete Question

The complete question is shown on the first uploaded image

Answer:

Explanation:

From he question we are told that

The first mass is $m_1 = 0.42kg$

The second mass is $m_2 = 0.47kg$

From the question we can see that at equilibrium the moment about the point where the string holding the bar (where $m_1 \ and \ m_2$ are hanged ) is attached is zero

Therefore we can say that

$m_1 * 15cm = m_2 * xcm$

Making x the subject of the formula

$x = (m_1 * 15)/(m_2)$

$= (0.42 * 15)/(0.47)$

$x = 13.4 cm$

Looking at the diagram we can see that the tension T on the string holding the bar where $m_1 \ and \ m_2$ are hanged is as a result of the masses ( $m_1 + m_2$ )

Also at equilibrium the moment about the point where the string holding the bar (where ( $m_1 +m_2$ ) and $m_3$ are hanged ) is attached is zero

So basically

$(m_1 + m_2 ) * 20 = m_3 * 30$

$(0.42 + 0.47) * 20 = 30 * m_3$

Making $m_3$ subject

$m_3 = ((0.42 + 0.47) * 20 )/(30 )$

$m_3 = 0.59 kg$

Beth has built a simple series circuit using wire, a battery, a lightbulb, and a switch. The bulb, however, does not light up when the switch is closed. Which describes a step that will help troubleshoot and work toward the solution of this problem?

A.
Reverse the way the wire is connected to the poles of the battery.

B.
Use an electrical meter to test the voltage of the battery.

C.
Shorten the length of wire between the battery and the switch.

D.
Change the wiring scheme to parallel.

Answers

The right answer for the question that is being asked and shown above is that: "A. Reverse the way the wire is connected to the poles of the battery." the statement describes a step that will help troubleshoot and work toward the solution of this problem is that Reverse the way the wire is connected to the poles of the battery.

which of the following statements about black holes is false. a. Astronomers have never seen a black hole. b. A black hole sucks in matter like a vacuum cleaner. c. No light can escape from a black hole. d. All of the mass in a black hole is concentrated in a single point.

Answers

I love this question, because it gets at one of the greatest misconceptions about black holes.

Choice-B is false. A black hole does not suck matter in like a vacuum cleaner.

Answer:

a. Astronomers have never seen a black hole.

Explanation:

A black hole is 1-Dimensional point in space-time having density is extremely large such that space-time curvature bends enough for even light cannot escape. All the mass is concentrated at this point. A black hole is formed when a very high mass star dies. It goes supernova and collapses to form a black hole. It sucks in matter like a vacuum cleaner.

Astronomers have seen a black hole by actually viewing the event horizon which is a bright disk surrounding a black hole. Recently an image of a black hole was also released.

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