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3 years ago

14

Object A is positively charged. Object A and Object B

1 answer:

ozzi3 years ago

4 0

Answer: object B is negatively charged, object C is positively charged and object D is also positively charged

Explanation: since unlike charges attract and like charges repel, for object A which is positively charged and B to attract B must be negatively charged and then for B which is negatively charged and C to attract C must be positively charged and for C and D to repel they have to be of thesame charge which means D is positive as well.

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Explanation:

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2 years ago

Two cars are traveling along a straight line in the same direction, the lead car at 25 m/s and the other car at 35 m/s. At the m

Phoenix [80]

Answer:

a. $t_1=12.5\ s$

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Explanation:

Given:

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speed of lagging car, $u_{2}=35\ m.s^{-1}$

distance between the cars, $\Delta s=45\ m$

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a.

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$v_2^2=u_2^2+2.a_2.\Delta s$

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$a_2=$ acceleration of the chasing car after braking

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$a_2=-13.61\ m.s^{-2}$ must be the minimum magnitude of deceleration to avoid hitting the leading car before stopping

c.

time taken by the chasing car to stop:

$v_2=u_2+a_2.t_2$

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$t_2=2.5714\ s$ is the time taken to stop after braking

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