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JulijaS [17]
3 years ago
13

A car goes North a distance of 120 kilometers during a time period of 3.0 hours. What is the average

Physics
1 answer:
DIA [1.3K]3 years ago
8 0

Answer:

the average speed of the car during this time interval is 40 m/s i thinkk..

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Depending on circumstances, there are times when divers may wish to be positively, negatively or neutrally buoyant. True. False.
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Answer:

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Explanation:

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A charged object traveling 7 m in a uniform electric field of 5 N/C experiences a 4 J increase in Kinetic Energy.
Travka [436]

To solve this problem it is necessary to apply the principles of conservation of Energy in order to obtain the final work done.

The electric field in terms of the Force can be expressed as

E = \frac{F}{q} \rightarrow F=Eq

Where,

F = Force

E= Electric Field

q = Charge

Puesto que el trabajo realizado es equivalente al cambio en la energía cinetica entonces tenemos que

KE = W

KE = F*d

In the First Case,

4 = (qE)d\\q = \frac{4}{Ed}\\q = \frac{4}{5*7}\\q = 0.1142C

In Second Case,

KE = q E'd

KE = (0.1142)(40)(7)

KE = 31.976J

The total energy change would be subject to,

\Delta KE = 31.976-4

\Delta KE = 27.976J

Therefore the Kinetic Energy change of the charged object is 27.976J

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