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2 years ago

The diagram shows the electric field due to point charge Q. Which statements are correct? Check all that apply.

Physics

1 answer:

Bess [88]2 years ago

4 0

Answer:

The correct statements are:

A. The electric field is nonuniform.

D. Charge Q is positive.

E. If charge A moves toward charge Q, it must be a negative charge

Explanation:

The answer choices are:

A. The electric field is nonuniform.

B. The electric field is uniform.

C. Charge Q is negative.

D. Charge Q is positive.

E. If charge A moves toward charge Q, it must be a negative charge.

F. If charge A moves toward charge Q, it must be a positive charge.

<h2>Solution</h2>

The electric field is the electrostatic force per unit of charge,

$\vec E=\dfrac{\vec F}{Q}$

around around a charge, where another charge would experience the electrostatic force.

The electric field lines are shown in a diagram with arrows ditributed radially away from a positive charge and radially toward a negative charge.

Since the arrows are away from Q, Q is a positive charge: statement D.

Since the size of the arrows decreases as you move away from Q the stregth of the field is not uniform: statement A.

Since the charge Q is positive, a negative charge would be attracted toward it: statement E.

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dlinn [17]

Answer:

a = 4.72 m/s²

Explanation:

given,

mass of the box (m)= 6 Kg

angle of inclination (θ) = 39°

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magnitude of acceleration = ?

box is sliding downward so,

F - f = m a

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m g sinθ - μ N = ma

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2 years ago

In a car crash, large accelerations of the head can lead to severe injuries or even death. A driver can probably survive an acce

Mandarinka [93]

Answer:

0.22 m

Explanation:

We are told that the driver can survive an acceleration of 50g only if the collision lasts no longer than 30 ms. So,

$t = 30 ms = 0.030 s$

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where the negative sign is due to the fact that this is a deceleration, since the driver comes to a stop in the collision.

First of all, we can find what the initial velocity of the car should be in this conditions by using the equation:

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And since the final velocity is zero, v=0, and solving for u,

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And now we can find the corresponding distance travelled using the equation:

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2 years ago

At 1 atm pressure, the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. to the correct n

Andreyy89

Below are the choices that can be found elsewhere:

a. 268 kJ
b. 271 kJ 
c. 9 kJ 
d. 6 kJ

So the key thing to realize here is what the information given to you actually means. Sublimation is going from a sold to a gas. Vaporization is going from a liquid to a gas. Hence you can create two equations from the information that you have:

Ga (s) --> Ga (g) delta H = 277 kJ/mol 

Ga (l) --> Ga (g) delta H = 271 kJ/mol 

From these two equations, you can then infer how to get the melting equation be simply finding the difference between the sublimation (two steps) and vaporization (one step). 

Ga (s) --> Ga (l) delta H = 6 kJ/mol 

At this point, all you need to do is a bit of stoichiometry. You start with 1.50 mol and multiply by the amount of energy per mole (6 kJ/mol). 

*ANSWER* 
9 kJ/mol (C)

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2 years ago

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nataly862011 [7]

Answer:

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