You see lightning before you hear thunder because A) light waves can travel through a vacuum. Reactivate B) sound waves cannot travel through the air. C) light waves travel faster than sound waves. D) sound waves travel faster than light waves.
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Once the light is gone, the air collapses back in and creates a sound wave that we hear as a thunder. Light travels through air at about 186,000 miles every second.However, sound wave travels through the air at 1,000 feet per second.
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Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements.
b. Decrease
c. Remain the same
2 . If the mass of an object increases how will kinetic energy be effected ?
a. Increase
b. Decrease
c. Remain the same
3 . Two objects have the same mass; object A has a greater acceleration then B. Which Option will have Greater force?
a. Object A
b. Object B
c. Both the same
4 . The total amount of energy in a closed system remains______.
a. Will Increase
b. Will Decrease
c. Remain The same
PLEASE GIVE REAL CLEAR ANSWERS. Thank You
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yes science is the process of pursuing knowledge this is because without science we would not know about our brains and our brains help us peruse knowledge
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Answer:
It takes for the radio signal to travel from earth to the spaceship.
Explanation:
Given:
The frequency of the radio signal = hertz
Distance = meters
To Find:
The time taken for the radio signal to travel from the earth to the spaceship= ?
Solution:
we know that the time taken can be found by dividing the distance travelled by the speed at which the signal travels
So
Here the speed of the radio signal is equal the the speed of light
Now substituting the values,
Time taken is
=>
=>
=>
The time taken for the 2×10⁶ Hz radio signal to get to the spaceship from Earth is 243.33 s
What is speed?
Speed is the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
How to determine the time
- Speed of radio signal = 3×10⁸ m/s
- Distance = 7.3×10¹⁰ m
- Time =?
speed = distance / time
3×10⁸ = 7.3×10¹⁰ / time
Cross multiply
3×10⁸ × time = 7.3×10¹⁰
Divide both sides by 3×10⁸
Time = 7.3×10¹⁰ / 3×10⁸
Time = 243.33 s
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Answer:
the answer to the question is calcium
Final answer:
Calcium chloride is the most soluble salt in ice water due to its ability to lower the freezing point of water more than other salts.
Explanation:
When it comes to solubility in ice water, the most soluble salt would be the one that can lower the freezing point of water the most. Sodium chloride (NaCl) and its analogs calcium chloride (CaCl₂) and magnesium chloride (MgCl₂) are often used to melt ice on roads and sidewalks because they have lower freezing points than pure water. Among these salts, calcium chloride would be the most soluble in ice water. The group 2 metal salts, such as calcium chloride, dissociate to yield three particles per formula unit and provide a larger depression of the freezing point compared to sodium chloride, which dissociates to yield only two particles per formula unit.
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