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sp2606 [1]
3 years ago
15

A ball of mass 0.2 kg is dropped from a height of 10 m. How much mechanical energy does it have right before it hits the ground?

(Assume there is no air resistance.) Acceleration due to gravity is g 9.8 m/s2.
(PLEASE HELP NEED ANSWERS ASAP)

Physics
2 answers:
Bad White [126]3 years ago
7 0
0.2 kg * 9.81 m/s^2* 10= 19.62 or B
Alla [95]3 years ago
5 0

Answer:

19.6 J

Explanation:

Hello

The law of conservation of energy states that the total amount of energy in any isolated physical system remains unchanged over time, although this energy can be transformed into another form of energy,  in this case we initially have gravitational potential energy (due to height and gravity) and then it is transformed into kinetic energy (due to the movement)

E_{g} =mgh

where m is the mass , g the gravity and h the height

E_{k} =\frac{m*v^{2} }{2}

assuming that there is no air resistance the energy is conserved

E_{g} =E_{k} \\mgh = \frac{m*v^{2} }{2} \\\\

E_{g} =mgh = 0.2 kg*9.8\frac{m}{s^{2} } *10 m\\\\E_{g}=19.6 Joules\\ E_{g}=E_{k}=19.6 J\\

the energy it has right before it hits the ground is 19.6 J

I hope it helps.

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joja [24]
<span>a.The hiker had an easy, level trail from 11:00-12:00 and was able to travel the fastest during that time period.---> may be because this was indeed fastest  stage


b.The hiker got tired and walked the slowest from 1:00-2:00.---> no, because this was not the slowest stage


c.The hiker stopped for lunch from 11:00-12:00 and that slowed him down.---> no because this was the fastest stage


d.The hiker ended up in the same place that he started.---> no, because the hiker walked more toward east than toward west and more toward south than toward north.

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One difference between mixture and pure substances is that
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Pure substances can be elements made up exclusively of one kind of atom, or they can be compounds made up of molecules that include two or more elements. Mixtures can be homogeneous or heterogeneous depending on how finely mixed the components are.
7 0
2 years ago
The equation T^2=A^3 shows the relationship between a planet’s orbital period, T, and the planet’s mean distance from the sun, A
kobusy [5.1K]

Answer:

D. 2^(3/2)

Explanation:

Given that

T² = A³

Let the mean distance between the sun and planet Y be x

Therefore,

T(Y)² = x³

T(Y) = x^(3/2)

Let the mean distance between the sun and planet X be x/2

Therefore,

T(Y)² = (x/2)³

T(Y) = (x/2)^(3/2)

The factor of increase from planet X to planet Y is:

T(Y) / T(X) = x^(3/2) / (x/2)^(3/2)

T(Y) / T(X) = (2)^(3/2)

3 0
3 years ago
A thin aluminum rod lies along the x-axis and has current of I = 16.0 A running through it in the +x-direction. The rod is in th
coldgirl [10]

Answer:

a) The magnitude of the magnetic field = 7.1 mT

b) The direction of the magnetic field is the +z direction.

Explanation:

The force, F on a current carrying wire of current I, and length, L, that passes through a magnetic field B at an angle θ to the flow of current is given by

F = (B)(I)(L) sin θ

F/L = (B)(I) sin θ

For this question,

(F/L) = 0.113 N/m

B = ?

I = 16.0 A

θ = 90°

0.113 = B × 16 × sin 90°

B = 0.113/16 = 0.0071 T = 7.1 mT

b) The direction of the magnetic field will be found using the right hand rule.

The right hand rule uses the first three fingers on the right hand (the thumb, the pointing finger and the middle finger) and it predicts correctly that for current carrying wires, the thumb is in the direction the wire is pushed (direction of the force; -y direction), the pointing finger is in the direction the current is flowing (+x direction), and the middle finger is in the direction of the magnetic field (hence, +z direction).

3 0
3 years ago
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