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2 years ago

15

A woman with a mass of 60 kg climbs a set of stairs that are 3m high How much gravitational potential energy does she gain a res

ult of the climb?
Pls show your solution..
MAR AS BRAINLIEST

1 answer:

Bess [88]2 years ago

4 0

540 j

hope it helpssssssssssss

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A point charge of 4 µC is located at the center of a sphere with a radius of 25 cm. Find the electric flux through the surface o

givi [52]

Answer:

Ф = 4.5176x10⁵ N . m² / C

Explanation:

In this case, we need to use two expressions in order to calculate the electric flux of the sphere.

First the Electric flux is calculated using this expression:

Ф = E * A (1)

Where:

E: Electric field

A: Area of the sphere

To get the electric field E, we use this expression:

E = K * q / r² (2)

If we replace (2) into (1) we have the following:

Ф = K * q * A / r² (3)

Finally, we need to know the expression to get the area of a sphere which is the following:

A = 4πr² (4)

Replacing into (3):}

Ф = K * Q * 4πr² / r² discarting r²:

Ф = K * Q * 4π (5)

Now, all we need to do is replace the given values and solve for the electric flux of the sphere:

Ф = 8.98755x10⁹ * 4x10⁻⁶ * 4 * π

<h2>Ф = 4.5176x10⁵ N . m² / C</h2>

Hope this helps

5 0

3 years ago

a 2.0kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill, how fast will it be going?

ratelena [41]

Speed of ball is 19.80 m/s .

<u>Explanation:</u>

We have , a 2.0 kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill,We need to find how fast will it be going.Let's find out:

We know that,

Potential energy : This is the energy possessed by an object due to it's virtue of height and is given by $P.E = mgh$ , where m is mass , g is acceleration due to gravity & h is height !

Kinetic energy : This is the energy possessed by an object due to it's virtue of motion and is given by $K.E = \frac{1}{2}mv^2$ , where m is mass & v is the velocity of object !

By conservation of energy :

⇒ $P.E.=K.E$

⇒ $mgh=\frac{1}{2} mv^2$

⇒ $v=\sqrt{2gh}$

According to question , h=20 m i.e.

⇒ $v=\sqrt{2(9.8)20}$

⇒ $v=\sqrt{392}$

⇒ $v=19.80m/s$

Hence , Speed of ball is 19.80 m/s .

7 0

3 years ago

One liter is equal to 100 milliliters true or false

IRINA_888 [86]

Answer:

No, a liter is equal to 1000 milliliters

7 0

3 years ago

Read 2 more answers

You name binary ionic compounds by naming the first element or the ___ first,

Nuetrik [128]

Answer:

cation, anion

Explanation:

Binary Ionic Compounds- Binary means 2, ionic relates to charges. Therefore binary ionic compounds have TWO elements, with charges that cancel eachother out. The cation (or positive charge) goes before the anion (or negative charge)

example:

NaCl

Na^+1

Cl^-1

Sodium Chloride

6 0

4 years ago

A boy reaches out of a window and tosses a ball straight up with a speed of 10 m/s. The ball is 20 m above the ground as he rele

HACTEHA [7]

Answer:

25 m

9.9 m/s

22 m/s

Explanation:

m = Mass of ball

v = Velocity

g = Acceleration due to gravity = 9.81 m/s²

Applying conservation of energy

$mgh=\dfrac{1}{2}mv^2\\\Rightarrow h=\dfrac{v^2}{g}\\\Rightarrow h=\dfrac{10^2}{2\times 9.81}\\\Rightarrow h=5.09683\ m$

The height above the ground is 5.09683+20 = 25.09683 m = 25 m

$mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 5}\\\Rightarrow v=9.9\ m/s$

The ball's speed as it passes the window on its way down is 9.9 m/s

$mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 25}\\\Rightarrow v=22.14723\ m/s$

The speed of impact on the ground is 22 m/s

7 0

3 years ago