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Sergeeva-Olga [200]
3 years ago
7

If the current and the resistance in a circuit both double, what will happen to the voltage?

Physics
1 answer:
Westkost [7]3 years ago
5 0
It is A it will stay the same 

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Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.2589 N when separated by
Harlamova29_29 [7]

Answer:

q_1 = 7.19 \times 10^{-6} C

q_2 = -1.0 \times 10^{-6} C

Explanation:

Let the initial charge on the two spheres are

q_1, -q_2

now we know that the force between them is given as

F = \frac{kq_1q_2}{r^2}

0.2589 = \frac{kq_1q_2}{0.5^2}

q_1q_2 = 7.19 \times 10^{-12}

now when two spheres are connected then final charge on them is given as

q = \frac{q_1 - q_2}{2}

now the force between them is given as

0.3456 = \frac{k(q_1 - q_2)^2}{4(0.5)^2}

now we have

q_1 - q_2 = 6.19 \times 10^{-6}

So by solving above two equations we have

q_1 = 7.19 \times 10^{-6} C

q_2 = -1.0 \times 10^{-6} C

3 0
2 years ago
What are some of the downsides of using hydroelectric power?.
never [62]
Has an Environmental Impact. Perhaps the largest disadvantage of hydroelectric energy is the impact it can have on the environment.
It Displaces People.
It's Expensive.
There are Limited Reservoirs.
There are Droughts.
It's Not Always Safe
4 0
2 years ago
The cabinet is mounted on coasters and has a mass of 45 kg. The casters are locked to prevent the tires from rotating. The coeff
stira [4]

Answer:

the force P required for impending motion is 132.3 N

the largest value of "h" allowed if the cabinet is not to tip over is 0.8 m

Explanation:

Given that:

mass of the cabinet  m = 45 kg

coefficient of static friction μ =  0.30

A free flow body diagram illustrating what the question represents is attached in the file below;

The given condition from the question let us realize that ; the casters are locked to prevent the tires from rotating.

Thus; considering the forces along the vertical axis ; we have :

\sum f_y =0

The upward force and the downward force is :

N_A+N_B = mg

where;

\mathbf { N_A  \ and  \ N_B} are the normal contact force at center point A and B respectively .

N_A+N_B = 45*9.8

N_A+N_B = 441    ------- equation (1)

Considering the forces on the horizontal axis:

\sum f_x = 0

F_A +F_B  = P

where ;

\mathbf{ F_A \ and \ F_B } are the static friction at center point A and B respectively.

which can be written also as:

\mu_s N_A + \mu_s N_B  = P

\mu_s( N_A +  N_B)  = P

replacing our value from equation (1)

P = 0.30 ( 441)    

P = 132.3 N

Thus; the force P required for impending motion is 132.3 N

b) Since the horizontal distance between the casters A and B is 480 mm; Then half the distance = 480 mm/2 = 240 mm = 0.24 cm

the largest value of "h" allowed for  the cabinet is not to tip over is calculated by determining the limiting condition  of the unbalanced torque whose effect is canceled by the normal reaction at N_A and it is shifted to N_B:  

Then:

\sum M _B = 0

P*h = mg*0.24

h =\frac{45*9.8*0.24}{132.3}

h = 0.8 m

Thus; the largest value of "h" allowed if the cabinet is not to tip over is 0.8 m

6 0
3 years ago
What happens to water when it changes to ice?
mamaluj [8]

When water changes to ice, its density decreases and its volume increases.

7 0
3 years ago
When you drive a car around a curve that is not banked, what force provides the centripetal acceleration? HINT: Think about turn
algol [13]
The centripetal force is provided by the friction between the tyres and the ground. That's why a car will slip on ice, because there is less friction.
3 0
2 years ago
Read 2 more answers
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