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3 years ago

8

give reason Nikki is walking on the road with the load on her head. she does not work against Gravity

1 answer:

erma4kov [3.2K]3 years ago

6 0

Answer:

Hello There!!

Explanation:

There is no work done against the force of gravity because the angle of displacement and the direction is 90°.

hope this helps,have a great day!!

~Pinky~

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Sarah and Devon are involved in an egg catching contest. They stand a fixed distance apart and toss a raw egg back and forth to

Georgia [21]

Answer:

The correct answer is - B. Increase the time it takes to stop the egg once it hits his hand.

Explanation:

In order to catch the egg the force and time makes an impulse to the egg to change its momentum and bring it to rest. In order to change the momentum, one needs to decrease the force exerted onto the egg and increase the time it takes to make it rest.

Less force can be given to the egg by increasing the time to bring it to rest stop the egg once it hits his hand. Other than this it should be caught to the sides.

6 0

3 years ago

The speed of an electromagnetic wave traveling in a transparent nonmagnetic substance is v = 1/ κμ0ε0 , where κ is the dielectri

vladimir1956 [14]

Answer:

$v=2.24\times 10^{8}\ m/s$

Explanation:

Given that,

The speed of an electromagnetic wave traveling in a transparent nonmagnetic substance is given by :

$v=\dfrac{1}{\sqrt{k\mu_o\epsilon_o}}$

Where

k is the dielectric constant of the substance.

v is the speed of light in water

$c=\dfrac{1}{\sqrt{1.78\times 4\pi \times 10^{-7}\times 8.85\times 10^{-12}}}$

$v=2.24\times 10^{8}\ m/s$

So, the speed of light in water is $2.24\times 10^{8}\ m/s$

7 0

4 years ago

Distance divided by time what is velocity

bearhunter [10]

Yup displacement covered /time taken. bcz both velocity and displacement are vectors

7 0

3 years ago

A 7.45 nC charge is located 1.66 m from a 4.22 nC point charge. (a) Find the magnitude of the electrostatic force that one charg

BaLLatris [955]

Answer:

a. $F=1.03\times 10^{-7}N$

b.Repulsive

Explanation:

We are given that

$q_1=7.45nC=7.45\times 10^{-9}C$

$1nC=10^{-9}C$

$q_2=4.22nC=4.22\times 10^{-9}C$

r=1.66m

We know that

Electrostatic force = $F=k\frac{q_1q_2}{r^2}$

r=Distance between $q_1\;and\;q_2$

k=Constant= $9\times 10^9Nm^2C^{-2}$

Using the formula

a.The magnitude of the electrostatic force= $F=\frac{9\times 10^9\times 7.45\times 10^{-9}\times 4.22\times 10^{-9}}{(1.66)^2}$

The magnitude of the electrostatic force= $F=1.03\times 10^{-7}N$

b.Both charge are positive .We know that when like charges repel each other and unlike charges attract to each other.

Therefore, the force between given charges is repulsive.

7 0

3 years ago

A proton has a positive electric charge of q = 1.6 × 10–19 coulombs. what is the electric potential at a point 5.3 × 10–11 m fro

Natalija [7]

B. The electric potential at the given point from the proton is 2.7 x 10¹ volts

<h3>Electric potential of the proton</h3>

The electric potential of the proton is calculated as follows;

V = kq/r

where;

k is Coulomb's constant
q is charge
r is distance

V = (9 x 10⁹ x 1.6 x 10⁻¹⁹)/(5.3 x 10⁻¹¹)

V = 27.2 volts

V = 2.7 x 10¹ volts

Learn more about electric potential here: brainly.com/question/14306881

#SPJ1

4 0

2 years ago