For a ball that is dropped from rest, what is its average velocity from t=1s to t=2s?

Mark creates a graphic organizer to review his notes about electrical force. Which labels belong in the regions marked X and Y?

sveta [45]

Answer:

The correct answer is A

Explanation:

The question requires as well the attached image, so please see that below.

Coulomb's Law.

The electrical force can be understood by remembering Coulomb's Law, that describes the electrostatic force between two charged particles. If the particles have charges $q_1$ and $q_2$ , are separated by a distance r and are at rest relative to each other, then its electrostatic force magnitude on particle 1 due particle 2 is given by:

$|F|=k \cfrac{q_1 q_2}{r^2}$

Thus if we decrease the distance by half we have

$r_1 =\cfrac r2$

So we get

$|F|=k \cfrac{q_1 q_2}{r_1^2}$

Replacing we get

$|F|=k \cfrac{q_1 q_2}{(r/2)^2}\\|F|=k \cfrac{q_1 q_2}{r^2/4}$

We can then multiply both numerator and denominator by 4 to get

$|F|=k \cfrac{4q_1 q_2}{r^2}$

So we have

$|F|=4 \left(k \cfrac{q_1 q_2}{r^2}\right)$

Thus if we decrease the distance by half we get four times the force.

Then we can replace the second condition

$q_{2new} =2q_2$

So we get

$|F|=k \cfrac{q_1 q_{2new}}{r_1^2}$

which give us

$|F|=k \cfrac{q_1 2q_2}{r_1^2}\\|F|=2\left(k \cfrac{q_1 q_2}{r_1^2}\right)$

Thus doubling one of the charges doubles the force.

So the answer is A.

8 0

3 years ago

Read 2 more answers

A billiard ball moving at 6.00 m/s strikes a stationary ball of the same mass. after the collision, the first ball moves at 5.39

kodGreya [7K]

To do this question, we need to know that momentum is conserved, meaning the overall velocity of the two balls has to be the same before and after the collision. 

After collision... 

Ball 1: 4.33m/s *cos 30 = 3.75 m/s (x-component) 
4.33m/s * sin 30 = 2.165 m/s ( y-component) 

Ball 2 (struck ball): 5 m/s - 3.75m/s = 1.25 m/s (x-component) 
-2.165 m/s (y-component) note: it has to be in the opposite direction to conserve momentum 

tan-1(2.165/1.25) = 60 degrees 
Struck ball's velocity = sqrt(1.25^2 + 2.165^2) = 2.5 m/s at 60 degree with respect to the original line of motion. 

Hope you understand!

5 0

4 years ago

Read 2 more answers

An automobile light has a 1.0-a current when it is connected to a 12-v battery. determine the resistance of the light.

Elis [28]

Resistance of automobile light is equal to 12 ohms.
Resistance = Voltage / Current
where
Voltage = 12 volts
Current = 1.0 Amperes
Resistance = 12 volts/ 1.0 amperes
Resistance = 12 ohms.
Automobile light has 12 ohms resistance when it is connected to 12volts battery with 1.0 ampere current.

3 0

3 years ago

A 20×10⁹charge is moved between two points A andB that are 30mm apart and have an electric potential difference of 600v between

Alona [7]

Answer:

John Felix Anthony Cena is an American professional wrestler, actor, and television presenter. He is currently signed to WWE. Born and raised in West Newbury, Massachusetts, Cena moved to California in 1998 to pursue a career as a bodybuilder.

Explanation:

7 0

3 years ago

6. If the force applied is 4.5N and the spring constant is 9, how much will the

Andrew [12]

Answer:

F/K=4.5/9=0.5

Explanation:

that's the way to find it

3 0

3 years ago