What si unit measures speed ?

Suppose the electric field in some region is found to be E = kr3 ˆr, in spherical coordinates (k is some constant). (a) Find the

Assoli18 [71]

Answer:

Part a)

$\rho = 3\epsilon_0 k r^2$

Part b)

$Q = 4\pi \epsilon_0kR^5$

Explanation:

Part a)

As we know that electric field intensity due to some given charge distribution is given as

$E = kr^3 \hat r$

now electric flux through a spherical surface of radius r is given as

$\phi = E. A$

$\phi = kr^3(4\pi r^2)$

now by Guass law we know that

$E.A = \frac{q}{\epsilon_0}$

$q = 4\pi \epsilon_0kr^5$

now volume charge density is given as

$\rho = \frac{q}{\frac{4}{3}\pi r^3}$

$\rho = 3\epsilon_0 k r^2$

Part b)

Total charge inside the radius R is given as

$Q = 4\pi \epsilon_0kR^5$

7 0

3 years ago

A pool ball is rolling at a velocity of 12 cm/s to the right when it is hit by another ball. It continues moving right at a velo

madam [21]

Answer:

B

Explanation:

Acceleration = rate of change in velocity

a = (21-12)/(0.45) = 20cm/s^2

6 0

3 years ago

How do forces work In nature? (short answer please I'm lazy)

melisa1 [442]

Answer:

Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay. All the known forces of nature can be traced to these fundamental forces

Explanation:

6 0

3 years ago

Read 2 more answers

Juan makes an adjustment to an electromagnet that causes the electromagnet to lose some of its strength. What did Juan most like

vampirchik [111]

A: He reduced the number of loops in the wire.

Explanation: The fewer coils of solenoid there are around the magnet, the weaker the electromagnet is. FYI: The solenoid <em>is</em> the wire in the electromagnet.

5 0

4 years ago

Read 2 more answers

Alcohol consumption slows people's reaction times.In a controlled government test,it takes a certain driver 0.320 s to hit the b

svetoff [14.1K]

Answer:

When the person is drunk the car travels 20.1 meters more than when the person is sober. The distance traveled by car is:

Person drunk: 28.1 m

Person sober: 8 m

Explanation:

The distance traveled can be found using the following equation:

$v = \frac{x}{t} \rightarrow x = v*t$