Physics, 03.02.2020 21:43, nehaljay1883

Hello, i really need with these 4 questions. they are both physical science combined with mathematics. i am giving out brainliest, and 50 points for whoever is an emergency and i would appreciate it.

Hello, i really need with these 4 questions. they are both physical science combined with mathemati

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answered: madelyngv97

1) We know, W = F * s
w = 30 * 15
w = 450 Joules

Now, Power = work done / Time taken
p = 450 / 8
p = 56.25 Watts

2) When ball lifts from bottom to the top, it's P.E. will rise to the top and it will be greatest at the top point, whereas K.E. will decrease during the rise, and it will be lowest at the highest point, and will be maximum at the bottom point, when potential energy will be zero

3) On the Top, you have highest potential energy as it is directly proportional to the height of the object/person, and for bottom, it will be zero whereas Kinetic Energy will be maximum as sum of their magnitude must be constant at each instances (According to Law of Conservation of Energy).
Friction will decrease the amount of Energy by some extent due to it's opposing nature

4) Potential Energy (Initial one) = m * g * h
= 25 * 9.8 * 4 = 980 J

Kinetic Energy = 1/2 mv²
= 1/2 * 25 * 5² = 312.5 J

Energy lost = Final - Initial = 980 - 312.5 = 667.5 Joules

Hope this helps!

answered: vivi297

Work=Force times distance
Work= 30×15
Work=450
So you did 450J of work

answered: Guest

i will answer your question if you answer mine

answered: Guest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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Hello, i really need with these 4 questions. they are both physical science combined with mathemati...