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3 years ago

What comes before Action-reaction?

1 answer:

4 0

These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

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A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake.

ArbitrLikvidat [17]

Answer:

L = 499 m

Explanation:

If we assume that the speed of sound is constant, that travels along a straight line, and that the echo is instantaneous, we can find the total distance travelled by the sound, as follows, just applying the definition of average velocity:

$\Delta x = v_{s} * t = 343 m/s* 2.91 s = 998 m$

If we assume that the time needed to reach to the cliff, is the same used for the return travel, the length of the lake will be exactly half of the total distance calculated:

$l_{lake} = \frac{\Delta x}{2} = \frac{998m}{2} = 499 m$

The length of the lake is 499 m.

8 0

3 years ago

Only the sun and other stars in space generate these kinds of waves:

Reika [66]

Answer:

<h2>Ultraviolet Waves.</h2>

Explanation:

The Sun emits waves called "Solar Waves", which have a wavelengths between 160 and 400 nanometers. According to the electromagnetic spectrum, these waves are defined as Ultraviolet, which have a frequency around the order of $10^{16}$ , which is really intense and high energy.

Therefore, the answer is Ultraviolet Waves.

6 0

3 years ago

A man is walking while riding a train. He says he is moving at 2 mph. A woman standing on a platform at a train station says the

-BARSIC- [3]

The woman is correct because it is the pace he is moving not walking.

5 0

4 years ago

When a chemical reaction occurs in a sealed container, what is the total mass after the reaction compared to the total mass befo

oksano4ka [1.4K]

The answer is A. the same.

Since the container is sealed, their will be no loss of material from the container which means that the mass won’t vary.

4 0

3 years ago

Read 2 more answers

A string of 18 identical holiday tree lights is connected inseries to a 190V source. The string dissipates 62.0 W. One of thebul

PtichkaEL [24]

Answer:

549.9 ohms, 65.65 watts, the power went up

Explanation: power P = V²/R

v= 190volts , P =62watts

from P =V²/R

62=190²/R

making R the subject

R×62= 190²

62R =36100

R=36100/62

R=586.25 ohms

Resistance of each lamp = 586.26/18 =32.3ohms

a) resistance of the light string now = 17×32.3 = 549.9 ohms

b) P=V²/R

where R=549.9ohms , P=?

P=190²/549.9

P=36100/549.9

P=65.65watts

Power dissipated has increased( went up )

7 0

3 years ago