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3 years ago

13

There are slightly more than one hundred elements known to exist. The smallest complete unit of an element that serves as the ba

sic building block of matter is the:
A) atom
B) Proton
C) neutron
D) nucleus

1 answer:

Nostrana [21]3 years ago

7 0

A) it is atom for e2020

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Ferns that eject spores generally do so in pairs, with two spores flying off in opposite directions. The structure from which th

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Answer:

It cancels recoil.

Explanation:

For each action there is an equal an opposite reaction.

The principle of conservation of momentum tell us that if a single spore were ejected the fern would suffer a recoil from it. This recoil would take energy and speed from the spore. But if they are ejected in pairs the recoil is canceled and all the energy is transferred to the spores resulting in higher speeds.

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Josh tests an unknown liquid substance using litmus paper. When he compared the used litmus paper to a pH scale, the color match

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2 years ago

The type of specialized cell whose main function is to communicate between neurons is a(n):

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2 years ago

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3 years ago

Four point charges have equal magnitudes. Three are positive, and one is negative, as the drawing shows. They are fixed in place

Semmy [17]

Answer:

Ans= 9

See attached picture for clearer solution.

Explanation:

The net electrostatic force acting on charge A = 2/ 2 + 2 /(2) 2 − 2 /(3) 2 = 2 / 2 (1 + 1/4 – 1/9 ) = 41/36 2/2 .

The net electrostatic force acting on charge B = 2/2 + 2/(2)2 − 2/2 = 1/4 2/d2 .

The net electrostatic force acting on charge C = 2/2 + 2/(2)2 + 2/2 = 2/2 (1 + 1 4 + 1) = 9/4 2/2 .

The net electrostatic force acting on charge D = 2/2+ 2 /(2)2 + 2/(3)2 = 2 /2 (1 + 1/4 + 1/9 ) = 49/36 2/ 2 .

The ratio of the largest to the smallest net force = 9/4*2/2 / 1/4 2/2 . = 9

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2 years ago