Apositive point charge q is fixed on a very large horizontal frictionless tabletop. a second positive point charge q is released from rest near the stationary charge and is free to move. which statement best describes the motion of q after it is released? as it moves farther and farther from q, its speed will keep increasing. as it moves farther and farther from q, its speed will decrease. as it moves farther and farther from q, its acceleration will keep increasing. its speed will be greatest just after it is released. its acceleration is zero just after it is released. a charge q is uniformly spread over one surface of a very large nonconducting square elastic sheet having sides of length d. at a point p that is 1.25 cm outside the sheet, the magnitude of the electric field due to the sheet e. if the sheet is now stretched so that its sides have length 2d, what is the magnitude of the electric field at p? e e/2 2e e/4 4e

Explanation:

When a second positive point charge q is released from rest near the stationary charge and is free to move , the stationary charge will exert a repulsive force upon it which will go on decreasing as the mobile charge moves away from stationary charge. So it will have decreasing but positive acceleration . So its velocity will go on increasing but with decreasing rate.

So the correct statement is

"As it moves farther and farther from Q, its speed will keep increasing".

The electric field near a charged sheet is proportional to the charge density on the charged surface .As the area has been increased 4 times , area charge density will become 1/4 times , so electric field near it will also reduce to 1/4 times . Hence new electric field will be

E / 4 . Ans .

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

carbon is found in all living things. carbon atoms move constantly through

living organisms, the oceans, the atmosphere, and the earth’s crust in what is

known as the carbon cycle. the directions taken by carbon atoms through this

cycle are very complicated and can take millions of years to make a full circle.

all animals, from humans to the dinosaurs are part of the carbon cycle. when

animals eat food, they get carbon in the form of carbohydrates and proteins.

in animals, oxygen combines with food in the cells to produce energy for daily

activity and then gives off carbon. the carbon combines with oxygen to form

carbon dioxide (co2) and is released back into the atmosphere as a waste

product when animals breathe and exhale.

from 145-65 million years ago, earth was much

hotter than today and covered with dense,

tropical swamp forests. the trees and other

plants were immense and

provided an endless supply of

food for the giant animals that

roamed the land. somewhere in

the air above one of these

forests, a lone carbon atom has joined

up with two oxygen atoms to form a molecule of co2.

the co2 molecule was sucked into the tiny holes (stomata) on the leaf of a

fern plant and joined with sunlight, chlorophyll and water to make food and

energy in the plant’s cells through photosynthesis. the oxygen (o2) from the

co2 molecule was sent back into the atmosphere; the carbon atom (c) was

detached and used to make a molecule of sugar.

if that carbon atom had been eaten instead, a totally

different situation would have developed. let’s say

that a giant plant-eating dinosaur (herbivore) ate the

fern for breakfast, and swallowed the carbon in the

fern in the form of carbohydrates and proteins. in

the process of respiration, oxygen combined with

the carbohydrates and proteins in the dinosaur’s cells

to provide energy for its daily activity.