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3 years ago

If you want to lift a 5-kg box to a height of 2 meters, how much work must be

Physics

2 answers:

kramer3 years ago

7 0

Answer:100joules

Explanation:

Work= force×distance

Work=mass×acceleration×distance

Work=5×10×2

Work=100joules

grandymaker [24]3 years ago

6 0

Answer:

98J is the correct answer

Explanation:

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Different wavelengths of light are seen as different. A. Atoms B. Sounds C. Colors D. Speeds

attashe74 [19]

Different wavelengths of light are seen as colors

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3 years ago

A ball is spun around in circular motion such that its frequency is 10 Hz.

Scilla [17]

Answer:

a = 0.1 s b. 10 s

Explanation:

Given that,

The frequency in circular motion, f = 10 Hz

(a) Let T is the period of itsrotation. We know that,

T = 1/f

So,

T = 1/10

= 0.1 s

(b) Frequency is number of rotations per unit time. So,

$t=\dfrac{n}{f}\\\\t=\dfrac{100}{10}\\\\t=10\ s$

Hence, this is the required solution.

5 0

2 years ago

Firdavs [7]

1). The forces inside the atom are always, totally, completely, electrostatic forces. Those are so awesomely stronger than the gravitational forces that the gravitational ones are totally ignored, and it doesn't change a thing.

Parts 2 and 3 of this question are here to show us how the forces compare.

Part-2). The electrostatic force between a proton and an electron.

The constant in the formula is 9x10^9, and the elementary charge is 1.602 x 10^-19 Coulomb ... same charge on both particles, but opposite signs.

I worked through it 3 times and got 0.000105 N every time. So the best choice is 'C', even though we disagree by a factor of ten times. You'll see in part-3 that it really doesn't make any difference.

Part-3). Gravitational force between a proton and an electron.

The constant in Newton's gravity formula is 6.67x10^-11 . You'll have to look up the masses of the proton and the electron.

I got 2.163 x 10^-55 N ... exactly choice-C. yay !

Now, after we've slaved over a hot calculator all night, the thing that really amazes us is not only that the electrostatic force is stronger than the gravitational force, but HOW MUCH stronger ... 10^51 TIMES stronger. That's a thousand trillion trillion trillion trillion times stronger !

That's why it has no effect on the measurements if we just forget all about the gravitational forces inside the atom.

4 0

3 years ago

Read 2 more answers

A vector is given in terms of its magnitude, v=8.7m/s and its direction, 256 degrees standard position. a) what is this vector i

Wittaler [7]

Answer:

Explanation:

Given

magnitude of vector=8.7 m/s

Direction $=256^{\circ}$

Therefore vector x component is $=8.7\cos (256)$

=-2.104

i.e. it is acting in negative x axis

vector y component $=8.7\sin (256)=-8.44 m/s$

Therefore it lies in negative y axis

Judging vector x and y component

It lies in third quadrant

4 0

3 years ago

What is the difference between acceleration and linear acceleration?

Akimi4 [234]

Explanation:

Linear acceleration is a type of acceleration of a body along a straight path or line.

Acceleration is defined as the rate of change of velocity with time.

Acceleration = $\frac{Change in velocity}{time}$

There are different types of acceleration .

linear acceleration is used to describe the rate of change of velocity of a body along a straight path with time.
centripetal acceleration is the rate of change of velocity of a body traveling along a circular path with time. It is directed towards the center.
Angular acceleration is the rate of change of angular velocity.

Learn more:

Acceleration brainly.com/question/3820012

#learnwithBrainly

6 0

3 years ago