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3 years ago

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A mechanic pushes a 3.60 âœ• 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the c

ar moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car. (a) the speed v

1 answer:

Mkey [24]3 years ago

8 0

Are there any answer choices?

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Three equal point charges, each with charge 1.45 μCμC , are placed at the vertices of an equilateral triangle whose sides are of

LUCKY_DIMON [66]

Answer:

U = 80.91 J

Explanation:

In order to calculate the electric potential energy between the three charges you use the following formula:

$U=k\frac{q_1q_2}{r_{1,2}}$ (1)

k: Coulomb's constant = 8.98*10^9Nm^2/C^2

q1: q2 charge

r1,2: distance between charges 1 and 2.

For the three charges you have:

$U_T=k\frac{q_1q_2}{r_{1,2}}+k\frac{q_1q_3}{r_{1,3}}+k\frac{q_2q_3}{r_{2,3}}$ (2)

You use the fact that q1=q2=q3=q and that the distance between charges are equal. Then, in the equation (2) you have:

q = 1.45μC = 1.45*10^-6C

r = 0.700mm = 0.700*10^-3m

$U_T=3k\frac{q^2}{r}=3(8.98*10^9Nm^2/C^2)\frac{(1.45*10^{-6}C)}{0.700*10^{-3}m}\\\\U_T=80.91J$

The electric potential energy between the three charges is 80.91 J

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3 years ago

if a ball on a string swung in a circles and string suddenly breaks.the ball will move into what direction?

Akimi4 [234]

Answer: b

Explanation: did the quiz got it right

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Match the situation with the energy type.

anastassius [24]

Answer:

snowplow would be m, sun r , hb n , FB e ,and tiaa c

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Suppose you increase your walking speed from 5 m/s to 14 m/s in a period of 3 s. What is your acceleration

kirza4 [7]

5-14 m/s in 3 seconds
a=vf-vi/t
a=14-5/3
a=9/3
a=3 m/s^2

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so classmate states that continental drift could not be possible because it would take far too much force to move tectonic plate

Juliette [100K]

Any student who states that tectonic plates are too massive to move doesn't understand how much heat exists in the center of the earth. This heat is capable of moving the most massive of plates.

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