b. How many vibrations does it make in five seconds?
c. What is its period in seconds?
d. What is its frequency in hertz?
Why is gravity an example of scientific law?
Because it is a basic concept that defines a constant and universal behaviour of nature, gravity is seen as an illustration of a scientific law.
Scientific laws are succinct formulations that precisely explain a natural occurrence and are the result of in-depth observation and investigation. Einstein's theory of general relativity or Newton's law of universal gravitation both use the concept of gravity to explain how mass-containing objects interact with one another in space.
It offers a mathematical framework that enables researchers to perform precise projections and estimates about celestial body motion, the behaviour of things close to the surface of the Earth, and the structure of the cosmos.
The fact that gravity is recognised as a scientific rule is a reflection of the fact that it is widely accepted and has been shown to have practical applications.
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B-2s
C-400s
D-800s
Answer:
Option (B)
Explanation:
mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s,
Force, F = 40,000 N, Final velocity, v = 0 m/s
Let the impact time be t.
By use of Newton's second law
F = m a
where, a be the acceleration and m be the mass.
40000 = 2000 x a
a = 20 m/s^2
Acceleration is negative because the car is stopped.
Use first equation of motion,
v = u + a x t
0 = 40 - 20 x t
t = 2 second
B. doubled
C. one fourth as strong
D. quadrupled
Answer:
decreases one fourth of the original value.
Explanation:
according to coulomb's law the electrostatic force of attraction and repulsion magnitude is directly proportional to the product of magnitude of charges and inversely proportional to their distance (square distance).
So increases in distance between two charges results in decrease of electric force between two charges.
Answer:
C. one fourth as strong
Explanation:
Electric force is indirectly proportional to the square of the distance, so if you double the distance, electric force is = 1/2^2 = 1/4
In short, Your Answer would be: Option C
Hope this helps!
Answer: the top layer of the saturated zone
Explanation: Water table is also called as the groundwater table.The water table is the level below the surface of the ground where water is found.
The water table is the top layer of the saturated zone.The saturated zone is where the pores and fractures of the ground are saturated with water.
The water table keeps changing with the seasons and from year to year because it is affected by climatic variations and by the amount of precipitation.
The water table is the upper boundary of the saturated zone where all pores in soil and rocks are completely filled with water. It fluctuates depending on weather, seasons, and human activities, and it exists within porous soil and rock rather than nonporous ones.
The water table is the top layer of the saturated zone found below the Earth's surface, where all open spaces in soil and rocks are filled with water. This boundary separates the unsaturated zone (also called the vadose zone) above, which contains both air and water, from the saturated zone beneath, where all pores and fractures are fully inundated with water. Although the water table fluctuates with changes in weather, season, and human activity, it is not made of nonporous soil and rock. Instead, it resides within porous soil and rock that allow water to percolate down from the surface.
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