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3 years ago

Which statement best describes balancing equations and the law of conservation of mass?

Physics

2 answers:

dimaraw [331]3 years ago

6 0

Answer:

ccccccccccccccccc

Explanation:

:DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

··

Sauron [17]3 years ago

4 0

Answer:

it would be c, there are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.

Explanation:

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An athlete with mass m running at speed v grabs a light rope that hangs from a ceiling of height H and swings to a maximum heigh

-Dominant- [34]

Answer:

d) The 2 athletes reach the same height, because the athletes run with the same speed.

Explanation:

In the whole process , kinetic energy is converted into potential energy .

1/2 m v² = mgh

v² = 2gh

h = v² / 2g

In this expression we see that height attained does not depend upon mass of the object . At the same time it also makes it clear that it depends upon velocity . As the velocity in both the cases are same , height attained by both of them will be same. Hence option d ) is correct.

7 0

3 years ago

A small remote controlled car with mass 1.60 kg moves at a constant speed of12.0 m/s in a vertical circle with a radius of 5.0 m

kenny6666 [7]

Answer:

61.76 N.

Explanation:

Given the mass of the car, m = 1.60 kg.

The speed of the car, v = 12.0 m/s.

The radius of the circle, r = 5 m.

As car is moving in circular motion, so net force ( normal force + weight of the car) is equal to centripetal force enables the car to reamins in circular path.

Let N is the normal force.

So, $N - mg = F_c$

$N-mg=\frac{mv^2}{r}$

Now substitute the given values, we get

$N-1.60kg\times9.8m/s^2=\frac{1.60kg\times(12.0m/s)^2}{5.0m}$

$N=15.68+46.08$

N = 61.76 N.

Thus, the magnitude ofthe normal force exerted on the car by the walls is 61.76 N.

5 0

3 years ago

Check all the true statements about sound and light waves.

bixtya [17]

Answer:

See explanation.

Explanation:

Let us go through each of statements one by one.

Light waves may travel either through a transparent medium or through empty space.

Yes, light travels through empty space as well as through transparent media, however, in the latter its speed is slowed down.

Sound waves travel through all substances.

Sound waves are vibrations in a medium. All substances can vibrate; therefore, sound travels through all substances.

Light waves are absorbed and reflected by opaque materials so that no light travels through them.

This is true. The reason light does not pass through an opaque substance is because it is absorbed or reflected way from us.

Light waves cannot travel through empty space.

No, <em>electromagnetic radiation can travel through empty space</em> because it is not a disturbance in a medium.

Sound waves do not require a medium for traveling,

Nope. Sound waves are disturbances in a medium—they cannot exist independent; therefore, they require a medium for travelling.

Sound waves can only travel through transparent objects

No. Sound waves travel through all substances that can vibrate.

Sound waves require a medium for traveling,

As sound waves are vibrations in a medium, they need medium in which they can exist and travel.

5 0

2 years ago

Osteoporosis is most likely to be affected by which cycle?

oksano4ka [1.4K]

<span>Its the phosphorus cycle</span>

8 0

3 years ago

A large metallic sphere insulated from ground is charged with an electrostatic generator while a person standing on an insulatin

Mashutka [201]

It would be safe to stand on the insulated sphere since it is covered by a material that does not allow the passage of current or an insulator. With the insulator, the student can freely touch the sphere but without it, touching the sphere when it is charged is very dangerous as it would electrocute you since the charge from the sphere would freely flow onto your body. Insulators are being used to be able to protect humans from any danger in touching charged objects. Insulators have very high resistance to the flow of current through them. Examples are rubber, glass, cellulose, polystyrene and wood.

7 0

3 years ago