4 years ago

Describe how water may be treated before people use it

2 answers:

kramer4 years ago

7 0

They purify the water so that people can use it for things and drinking. They chloride, boil, or use ultraviolet light to kill bacterias that can harm us

brilliants [131]4 years ago

3 0

Water is treated by purifying it by adding slaked lime or potash alum

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a car starts from the rest and accelerates at 9.54m/s for 6.5 seconds. what is the distance covered by the car

uysha [10]

Answer:

= 201.53 meters

Explanation:

A car started from rest and accelerated at 9.54 m/s^2 for 6.5 seconds. How much distance was covered by the car?

Use the formula d = $\frac{at^{2} }{2} ,$

where d is the distance, t is the time and "a" is the acceleration.
$d=\frac{9*54*6*5^{2} }{2} = 201.53 m$

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2 years ago

Calculate the work done by a force of 30 N in lifting a load of 2 kg to a height of 10 m (g = 10 m/s2)

Mars2501 [29]

Answer:

300 J

Explanation:

Given :

Applied force = 30 N
Mass = 2 kg
Height = 10 m
g = 10 m/s²

Work done by the force :

Work done = Force x Displacement
Work done = mg x h
Work done = 30 N x 10 m
Work done = 300 J

Note :

What you have calculated is the work done by gravitational force on the object (that too, incorrectly)
But in the end, it asks for work done by the force of 30N
Hence, the given answer ~

3 0

2 years ago

If a bullet travels 2500 meters at a speed of 5 m/s, how long did it take?

MatroZZZ [7]

It would take 500 seconds, because 2500 divided by 5 is 500

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3 years ago

Constructive interference definition physics

elena-14-01-66 [18.8K]

Answer:

the interference of two or more waves of equal frequency and phase, resulting in their mutual reinforcement and producing a single amplitude equal to the sum of the amplitudes of the individual waves.

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3 years ago

A book has a weight of 15 N. What is the mass of the book

Ahat [919]

Answer:

m = 1.531kg

Explanation:

F = mg

m = F/g

m = 15/9.8 = 1.531kg (Approximately)

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3 years ago