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aivan3 [116]
4 years ago
6

Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill?

Physics
2 answers:
Tema [17]4 years ago
6 0
<span>Kinetic energy increases and potential energy decreases.
</span>
marishachu [46]4 years ago
3 0
The answer ur looking for is B  
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Which of the following is an SI unit
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SI will always be in metric, so the answer is D. Meter.

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Calculate the charge of a copper particle of mass 300 mg, if 0.01% of the electron are removed from it​
Alex73 [517]

Answer:

the charge will be neutral.

Explanation:According a book, metals want to "lose" electrons to achieve noble gas configuration. But at the same time, copper ions in a galvanic element are going to gain electrons from a zinc electrode. Why is it so? Is it because one of them HAS to gain/lose electrons, and zinc wins out in terms of achieving noble gas configuration?

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3 years ago
a boy pulls 23 kg box with a 100 N force at 39 above a horizontal surface if the coefficient of kinetic friciton between the box
tatuchka [14]

Answer:

Total work done is 2606.08 J.

Explanation:

Given :

Mass of box , m = 23 kg .

Force applied , F = 100 N .

Angle from horizon , \theta=39^o.

Coefficient of kinetic friction , \mu=0.16.

Distance travelled by box , d = 34 m .

Now ,

Total work done = work done by boy + work done by friction.

W=Fdcos\theta+f_sdcos\theta=Fd-\mu(mg) \\\\W=100\times cos39^o\times 34-0.16\times 23 \times 9.8 \\\\W=77.71\times 34-36.06=2606.08\ J.

Hence , this is the required solution.

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3 years ago
A baseball was thrown off of a 35 meter high building. It lands 50 meters from the base of the building.
shutvik [7]

Wonderful.

Look out below !

Was the FAA notified ?

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3 years ago
The uranium in nuclear reactors comes from supernova explosions.
Ludmilka [50]

Answer: this statement makes sense.

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Supernova explosion is a bright powerful explosion of the start, it takes place at the end of the cycle of a star. This explosion is caused by having too much matter in it's core, As the star runs out of nuclear fuel, some of its mass flows into its core. Eventually, the core is so heavy that it cannot withstand its own gravitational force. The core collapses, which results in a massive explosion of a supernova. During this explosion Elements heavier than iron are formed. An uranium atom is heavier than an iron atom, so uranium falls into this category of elements that comes from supernova explosion.

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3 years ago
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