Answer:
Top speed is 31.68 m/s
Explanation:
Speed of a body is the distance traveled by the body in unit time.
Speed is generally expressed in meter per second or kilometer per hour.
Here, the cheetah travels a distance of 274 m in 8.65 s.
Therefore, speed of cheetah is the distance traveled by it in one second.
For 8.65 s, distance traveled is 274 m
For 1 s, distance traveled will be
meters per second. This value is called speed.
So, speed is given as the ratio of the distance traveled to that of the time taken.
∴ Top speed of cheetah is given as:

Here,
is the top speed of cheetah.
Because a lot of things only live on earth earth is a place where all living this can live in
The illumination of the book is found to be approximately equal to 15 lx.
Option 1.
Explanation:
Luminous flux is the measure of power of the light emitted from a source and illumination is the property of the light to illuminate a given surface when it falls on the surface. So the measure of the region the light flux illuminates the surface is termed as illumination.
As here the luminous flux is given as 1759 lm and the distance of the object which has to be illuminated is placed 3 m away from the source ,the illumination is found to be directly proportional to the luminous flux and inversely proportional to the square of the distance between them

So, the illumination of the book is found to be approximately equal to 15 lx.
Answer:
PART A)
L = 97.4 dB
PART B)

PART C)
L = 67.9 dB
Explanation:
PART A)
level of sound is given as

now we have


PART B)
Since source is a spherical source
so here the intensity of sound is inversely depends on the square of the distance from the source



PART C)
level of sound is given as

now we have

