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2 years ago

7

You lift a 2.0 kg book from a shelf that is 1 m from the floor. What is the potential energy with respect to floor?

1 answer:

sladkih [1.3K]2 years ago

8 0

Potential energy = mgh
Potential energy = 2 x 9.8 x 1
Potential energy 19.6 J

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The older, geocentric model of the solar system placed the__________ at the center. Today's heliocentric model places the_______

DedPeter [7]

the answer is earth for the first one and sun for the second one

3 0

2 years ago

Read 2 more answers

How long Tina, a ballerina, in the air when she leaps straight up with a speed of 1.8 m/s?

Tems11 [23]

The acceleration of gravity on or near the surface of the Earth is 9.8 m/s².
Anything acted on only by gravity loses 9.8 m/s of upward speed, or gains
9.8 m/s of downward speed, every second.

Leaping straight upward at 1.8 m/s, Tina keeps rising until she runs out of
upward speed. That happens in (1.8/9.8) = 0.1837 second after the leap.

After that, Finkel's First Law of Motion takes over:
"What goes up must come down."

The dropping part of the leap is symmetrical with the first. Please don't
make me go through proving it. Tina hits the floor at the same speed of
1.8 m/s with which she left it, and it takes the same amount of time to drop
from the peak to the floor as it took to rise from the floor to the peak.

So her total time out of contact with the floor is

2 x (0.1837 sec) = 0.367 second (rounded)

3 0

3 years ago

3. Once water makes it's way through the entire water cycle,

MaRussiya [10]

Answer:

evaporation

Explanation:

without 4he evaporation it can even start the cycsl

7 0

2 years ago

Read 2 more answers

olasank [31]

This question involves the concept of Colomb's Law and electrostatic force.

The electrostatic force will be "0.2 N".

<h3>COLOMB'S LAW:</h3>

According to Colomb's Law, every charge exerts an electrostatic force on the other charge, which is directly proportional to the product of the magnitudes of both the charges and inversely proportional to the square of the distance between them.

$F=\frac{kq_1q_2}{r^2}$

where,

F = electrostatic force
k = Colomb's constant = 9 x 10⁹ N.m²/C²
q₁ = magnitude of first charge
q₂ = magnitude of second charge
r = distance between charges

In case of +2 C charges:

q₁ = q₂ = 2 C
r = ?
F = 0.1 N

Therefore,

$0.1\ N = \frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(2\ C)}{r^2}\\\\r^2=\frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(2\ C)}{0.1\ N}\\\\r^2=3.6\ x\ 10^{11}\ m^2$

Now, for the second case:

F = ?
q₁ = 2 C
q₂ = 4 C
r² = 3.6 x 10¹¹ m²

Therefore,

$F=\frac{(9\ x\ 10^9\ N.m^2/C^2)(2\ C)(4\ C)}{3.6\ x\ 10^{11}\ m^2}$

<u>F = 0.2 N</u>

Learn more about Colomb's Law here:

brainly.com/question/9774180

8 0

1 year ago

The range of human hearing extends from approximately 20 Hz to 20000 Hz. Find the wavelength for 20 Hz when the speed of sound i

sweet [91]

Answer:

Wavelength of sound wave corresponding to 20 Hz frequency will be 17.95 m

Explanation:

We have given that range of human hearing extends from 20 Hz and 20000 Hz

Velocity of sound wave is given 359 m /sec

We have to find the wavelength of the sound wave corresponding to 20 Hz

We know that velocity of sound wave is given by $v=\lambda f$ , here v is velocity $\lambda$ is wavelength and f is frequency

So $359=\lambda \times 20$

$\lambda =17.95m$

So wavelength of the sound wave corresponding to 20 Hz frequency will be 17.95 m

6 0

3 years ago