Answer : 1. cast iron
2. 50 mm/s
3. Reflection is the only process in which the wave does not continue moving forward.
Explanation :
1. The speed of sound is greatest in solid. So, the speed of the sound is fastest in cast iron. It is approximately equal to 4600 m/s.
2. Wavelength, λ = 10 mm
Frequency, υ = 5 Hz
Speed = wavelength × frequency
Speed = 10 mm × 5 s⁻¹
Speed, s = 50 mm/s
3. The bouncing back of light is called the reflection of light. In this process, the wave does not continue moving forward.
1- CAST IRON
2- 50 mm/s
3- Reflection is the only process in which the wave does not continue moving forward.
2) moon
3) Kuiper Belt object
4) meteor
2. Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?
1) A comet hit the sun and sent off fragments that became the planets.
2) The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets.
3) The planets formed at the center of a collapsing spinning cloud of gas and dust.
4) The sun and planets formed from a collapsing spinning cloud of gas and dust.
Answer:
1: C. Kuiper Belt object
2: D. The sun and planets formed from a collapsing spinning cloud of gas and dust.
Explanation:
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with solution and formula<3
It takes approximately 47 seconds for the sound of thunder to reach you at 20°C temperature.
The time it takes for the sound of thunder to reach you can be determined using the formula:
Time = Distance / Speed
Sound travels at a speed of approximately 343 meters per second at 20°C. Therefore, to calculate the time it takes for the sound to reach you, divide the distance by the speed:
Time = 16,090 meters / 343 meters per second
Time = 46.97 seconds
So, it takes approximately 47 seconds for the sound of thunder to reach you at 20°C temperature.
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Answer: 140 m
Explanation:
Let's begin by stating clear that motiont is the change of position of a body at a certain time. So, during this motion, the balloon will have a trajectory and a displacement, being both different:
The trajectory is the path followed by the body, the distance it travelled (is a scalar quantity).
The displacement is the distance in a straight line between the initial and final position (is a vector quantity).
So, according to this, the distance the balloon traveled during the first 45 s (its trajectory) is 140 m.
But, if we talk about displacement, we have to draw a straight line between the initial position of the balloon (point 0) to its final position (point 90 m). Being its displacement 95 m.
The correct answer to the question is - Deposition i.e the process by which a gas changes to a solid is called deposition.
EXPLANATION:
There are various thermal processes of state or phase change in which matter in one state is converted into matter in another state.
Deposition is the type of thermodynamic process of state or phase change in which a gaseous substance is directly converted into corresponding solid substance without entering into liquid phase.
During this process, the loss of thermal energy from gas is very fast. Hence, the gas directly enters solid phase without undergoing into liquid phase.
This process is just the opposite process of sublimation where a solid is converted into gas directly. That's why this process is also known as desublimation.
For instance, conversion of water vapor into ice.
away from the earths south pole
along the magnets field lines
none of the above