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Olin [163]
3 years ago
9

What type of phase change occurs when water vapor in the atmosphere changes to liquid water in clouds?

Physics
1 answer:
Mekhanik [1.2K]3 years ago
3 0

Answer:

condensation, the process of changing from a gas to a liquid

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If a person does 20 J of work on a book in 10 seconds, how powerful was the person while doing the work?
Korolek [52]

Answer:

2 W

Explanation:

P = W/t

= 20 J / 10 s

= 2 W

4 0
2 years ago
In our first example we will consider a very simple application of Newton’s second law. A worker with spikes on his shoes pulls
sweet-ann [11.9K]

Answer:

Acceleration=0.5m/s^2

Speed=0.67 m/s

Explanation:

We are given that

Horizontal force=F=20 N

Mass of box=m=40 kg

We know that

Acceleration=a=\frac{F}{m}

Using the formula

Acceleration of box=\frac{20}{40}=0.5m/s^2

The acceleration of the box=0.5m/s^2

Initial velocity=u=0

Force=F=30 N

Distance=s=0.3 m

a=\frac{30}{40}=\frac{3}{4} ms^{-2}

v^2-u^2=2as

Substitute the values

v^2-0=2\times \frac{3}{4}\times 0.3=0.45

v^2=0.45

v=\sqrt{0.45}=0.67m/s

Hence, the speed of the box after it has  been pulled a distance of 0.3 m=0.67 m/s

4 0
3 years ago
An object has a mass of 300 g. (a) What is its weight on Earth? (b) What is its mass on the Moon?
Neko [114]

Answer:

The mass of object is 300g.

Its weight on earth is W×0.3kg×9.8m/s2=2.94 N

Its weight on moon is A 300 g would be 48 g on the moon

GOOD LUCK!

7 0
2 years ago
At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.855 m/s2 if the acceleration du
natulia [17]
Given: Normal pull of gravity g = 9.8 m/s²; 

 g = 0.855 m/s²  (at a certain distance)

Universal gravitational constant G = 6.67 x 10⁻¹¹ N.m²/Kg²

Mass of the Earth Me = 5.98 x 10²⁴ Kg

Radius r = ?

g = GMe/r²

r = √GMe/g

r = √(6.67 x 10⁻¹¹ N.m²/Kg²)(5.98 x 10²⁴ Kg)/(0.855 m/s²)

r = 2.16 x 10⁷ m or 

r =  21,610 Km





.
5 0
3 years ago
How can you reduce the percentage uncertainty in measurements that you make?​
snow_tiger [21]

Answer:

you can decrease the uncertainty by making the same measurement multiple times and taking the average.

Explanation:

5 0
2 years ago
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