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3 years ago

Robbie found a rock in a stream. The rock was smooth and round. What MOST LIKELY caused this to happen?

Physics

1 answer:

Degger [83]3 years ago

7 0

Answer:

C, weathering by the water.

Explanation:

While in the river, it scraps againsts other rocks and things, which causes it to change shape. For example be smoother and round.

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A wave travels along a stretched horizontal rope. The vertical distance from crest to trough for this wave is 13 cm and horizont

shepuryov [24]

Answer:

(A) The wavelength of this wave is $56\; \rm cm$ .

(B) The amplitude of this wave is $6.5\; \rm cm$ .

Explanation:

Refer to the diagram attached. A point on this wave is at a crest or a trough if its distance from the equilibrium position is at a maximum.

The amplitude of a wave is the maximum displacement of each point from the equilibrium position. That's the same as the vertical distance between the crest (or the trough) and the equilibrium position.

On the diagram, the distance between the two gray dashed lines is the vertical distance between a crest and a trough. According to the question, that distance is $\rm 13\; \rm cm$ for the wave in this rope.
On the other hand, the distance between either gray dashed line and the black dashed line is the distance between a crest (or a trough) and the equilibrium position. That's the amplitude of this wave.

Therefore, the amplitude of the wave is exactly $\displaystyle \frac{1}{2}$ the vertical distance between a crest and a trough. Hence, for the wave in this question,

$\begin{aligned}& \text{Amplitude}\\ &= \frac{1}{2} \times (\text{Vertical distance between crest and trough}) \\ &= \frac{1}{2} \times 13\;\rm cm = 6.5\; \rm cm\end{aligned}$ .

The wavelength of a transverse wave is the same as the minimum (horizontal) distance between two crests or two troughs. That's twice the horizontal distance between a crest and a trough in the same period.

$\begin{aligned}& \text{Wavelength}\\ &= 2 \times (\text{Horizontal distance between adjacent crest and trough}) \\ &= 2 \times 28\;\rm cm = 56\; \rm cm\end{aligned}$ .

4 0

3 years ago

A man travels 630 km partly by car and partly by bus. It takes 12 hours in all of he travel 180 in by bus and rest by car. if he

Gekata [30.6K]

Answer : 45 km/hr

Explanation:

6 0

3 years ago

a car accelerates at a constant rate from 15 m/s to 25 m/s while it travels a distance of 125 m. How long does it take to achiev

atroni [7]

T=Vf-Vi/s
25m/s -15m/s/ 125m
10m/s /125m
=0.08s
I hope it’s correct !

6 0

3 years ago

What is watt equivalent to in terms of kg,m and s

daser333 [38]

F=ma=kg*m/s^2=N

Work=W=Force*d=N*m

P=W/time=N*m/s=kg*m^2/s^3=kg*m^2*s^-3=Watt

So 1 Watt of Power is equivalent to (kg*m^2)/s^3 or kg*m^2*s^-3

Any questions please feel free to ask. Thank you

3 0

3 years ago

Explain what happens when a massive star ends its life as a supernova

Bingel [31]

The ultimate fate of a star depends on its mass.
A massive star ends with a violent explosion called a supernova.
The matter ejected in a supernova explosion becomes a glowing supernova remnant.

Toward the end of its life, a massive supergiant star has a central iron core, surrounded by a shell where silicon is being fused to iron, surrounded by a shell where oxygen is being fused, surrounded by a shell where carbon is being fused, surrounded by a shell where helium is being fused, surrounded by a shell where hydrogen is being fused.

6 0

3 years ago