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3 years ago

A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres?

Physics

2 answers:

Pani-rosa [81]3 years ago

7 0

if your on edge its b fam! just took the unit test

kkurt [141]3 years ago

5 0

Answer: B - Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.

Explanation:

The rod is positively charged which means that it will repel positive charges (protons) and the rod will attract negative charges (electrons)

If you look at all the options that are given each one of them has a flaw, lets look at them one by one for better understanding of the concept:

(A) Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.

-Incorrect because protons which carry a positive charge CANNOT be attracted by the rod because as by the diagram the rod is also positively charged

(C) Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.’

Incorrect because sphere B has protons and not electrons as we can see it in the diagram given below.

(D) Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.

Incorrect because protons cannot move from sphere B to the rod since the rod is positively charged and like charges always repel.

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3 years ago

An escalator is 17.4 m long. If a person stands on the escalator, it takes 47.6 s to ride from the bottom to the top. If a perso

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3 years ago

Observer 1 rides in a car and drops a ball from rest straight downward, relative to the interior of the car. The car moves horiz

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a) 10.5 m/s

While for observer 1, in motion with the car, the ball falls down straight vertically, according to observer 2, which is at rest, the ball is also moving with a horizontal speed of:

$v_x = 3.80 m/s$

As the ball falls down, it also gains speed along the vertical direction (due to the effect of gravity). The vertical speed is given by

$v_y = u_y + gt$

where

$u_y =0$ is the initial vertical speed

g = 9.8 m/s^2 is the acceleration of gravity

t is the time

Therefore, after t = 1.00 s, the vertical speed is

$v_y = 0 + (9.8)(1.00)=9.8 m/s$

And so the speed of the ball, as observed by observer 2 at rest, is given by the resultant of the horizontal and vertical speed:

$v=\sqrt{v_x^2 +v_y^2}=\sqrt{(3.8)^2+(9.8)^2}=10.5 m/s$

b) $\theta = -68.8^{\circ}$

As we discussed in previous part, according to observer 2 the ball is travelling both horizontally and vertically.

The direction of travel of the ball, according to observer 2, is given by

$\theta = tan^{-1} (\frac{v_y}{v_x})=tan^{-1} (\frac{-9.8}{3.8})=-68.8^{\circ}$

We have to understand in which direction is this angle measured. In fact, the car is moving forward, so $v_x$ has forward direction (we can say it is positive if we take forward as positive direction).

Also, the ball is moving downward, so $v_y$ is negative (assuming upward is the positive direction). This means that the direction of the ball is forward-downward, so the angle above is measured as angle below the positive horizontal direction:

$\theta = -68.8^{\circ}$

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4 years ago

﻿A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres?

A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres?