3 years ago

Please help. 8th grade science

Physics

1 answer:

Aneli [31]3 years ago

3 0

Answer:

false

Explanation:

It doesn't the copper wire wouldn't even be pulled by the magnet at all and the electricity would stay inside of the the force of the copper wire

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30 points - how do I do 2 b and c?

Delvig [45]

1. its must be B and 2. must be C

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3 years ago

The speed of a 2.0-kg object changes from 30 m/s to 40 m/s during a 5.0-second time interval.

AnnyKZ [126]

Answer:

F = 2 * 30 / 5 = 12 N to stop forward motion

F = 2 * 40 / 5 = 16 N to accelerate to 90 degrees

(12^2 + 16^2)^1.2 = 20 N average force applied

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3 years ago

What remains constant during the trajectory of an object

S_A_V [24]

Answer:

projectile

Explanation:

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3 years ago

A student drops two metallic objects into a 120-g steel container holding 150 g of water at 25°C. One object is a 206-g cube of

spayn [35]

Answer:

Mass of the aluminium chunk = 278.51 g

Explanation:

For an isolated system as given the energy lost and gains in the system will be zero therefore sum of all transfer of energy will be zero,as the temperature will also remain same

A specific heat formula is given as

Energy Change = Mass of liquid x Specific Heat Capacity x Change in temperature

Q = m×c×ΔT

Heat gain by aluminium + heat lost by copper = 0 (1)

For Aluminium:

Q = $m\times0.897\frac{J}{g.k}\times(25-5)$

Q = m x 17.94 joule

For Copper:

$Q= 206g\times0.385\frac{J}{g.k} \times(88-25)$

Q= 4996.53 Joule

from eq 1

m x 17.94 = 4996.53

$mass of aluminium = \frac{4996.53}{17.94} g$

Mass of the aluminium chunk = 278.51 g

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3 years ago

Do the following calculation and express the final answer in

sammy [17]

Answer:

Explanation:

I got the same thing. So, i don't know but good luck

3 0

1 year ago