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oksian1 [2.3K]
3 years ago
10

A person skateboarding is part of a closed system that has 1,450 j of

Physics
1 answer:
soldier1979 [14.2K]3 years ago
6 0

The gravitational potential energy of the system will decreases from 1,250 J to 625 J. Option A is corect.

<h3>What is the law of conservation of energy?</h3>

According to the Law of Conservation of Energy, energy can neither be created nor destroyed, but it can be transferred from one form to another.

The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.

TE=KE+GPE

Case 1;

1450 = 200 J+GPE

GPE=1450 -200

GPE=1250 J

Case 2;

1450 = 825 J+GPE

GPE=1450 -825

GPE=625 J

The gravitational potential energy of the system will decreases from 1,250 J to 625 J.

Hence, option A is corect.

To learn more about the law of conservation of energy, refer to brainly.com/question/2137260.

#SPJ1

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Mechanical energy is similar to thermal energy because they both?
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Answer:

Mechanical energy is the ordered movement of the molecules as a single unit. Thermal energy is the random movement of the molecules. Mechanical energy can be 100% converted to thermal energy, but thermal energy cannot be fully converted to mechanical energy.

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2 years ago
What is the formula for newton's third law of motion​
dem82 [27]

Answer:

The third law states that all forces between two objects exist in equal magnitude and opposite direction: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal in magnitude and opposite in direction: FA = −FB.

Explanation:

You can literally google this. It would have been faster.

8 0
3 years ago
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Consider two copper wires of the same length. One has twice the cross-sectional area of the other. How do the resistances of the
JulsSmile [24]

Answer: a) when the cross section is doubled the resultant resistence  is a half. This means the thicker wire have half resistence than the thinner wire.

Explanation: In order to explain this behaviur we have to consider the expresion for the resistence which is given by:

R=\frac{\epsilon o  L}{A} where L and A are the length and the cross section for the wire, respectively.

From this expresssion we can conclude the above, this means

R=εo*L/A  if A is now 2A we have

R' = εo*L/2*A= R/2

6 0
3 years ago
Light travels slowest in high density media, faster in lower density media, and fastest in low density media.
lutik1710 [3]

Answer: C REFRACTION

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8 0
2 years ago
A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field directed
Hatshy [7]

Answer:

0.114m

Explanation:

From the general expression for the radius of the proton's resulting orbit, we have

r=\frac{mv}{qB}

where q is is the charge of the proton 1.6*10^{-19}C

m is the mass of the proton  1.67*10^{-27}kg

B is the magnetic field  0.040T

and v i the speed.

to determine the speed, we use the expression

Kinetic Energy=qV

1/2mv^{2}=qV

where <em>V  </em>is the voltage value i.e 1.0kv

and v is the speed

Hence, from simple rearrangement we have the speed v to be

v=\sqrt{\frac{2Vq}{m}} \\

if we substitute value, we have

v=\sqrt{\frac{2*1000*1.6*10^{-19} }{1.67*10^{-27}}} \\

carrying out careful arithmetic we arrive at

v=4.38*10^{5} m/s.

using the value for the speed in the expression for the radius of the orbit as stated earlier, we have

r=\frac{1.67*10^{-27}*4.38*10^{5}}{1.6*10^{-19}*0.04} \\

r=0.114m

7 0
3 years ago
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