A dog of mass 4 kg runs up a hill of height 8 m. How much gravitational potential energy does the dog gain?
2 answers:
Answer:
The gravitational potential energy is 314 J.
(A) is correct option.
Explanation:
Given that,
Mass of dog = 4 kg
Height = 8 m
We need to calculate the potential energy
Using formula of potential energy
m = mass
g = acceleration due to gravity
h = height
Put the value into the formula
Hence, The gravitational potential energy is 314 J.
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Answer:
d_{b} = 2 d_{a}
Explanation:
The electrical resistance for a cylindrical wire is described by the expression
R = ρ L / A
The area of a circle is
A = π r²
r = d / 2
A = π d²/4
We substitute
R = ρ L 4 /π d²
Let's apply this expression to our case, they indicate that the resistance of wire A is 4 times the resistance of wire B
= 4 R_{b}
We substitute
ρ 4/π ² = 4 (ρ 4/π d_{b}²)
1 / d_{a}² = 4 / d_{b}²
d_{a} = d_{b} / 2
Answer:
The answer is
Explanation:
The amount of energy is not enough to apply the relativistic formula of energy , so the definition of energy in this case is
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From the last equation,
where
and the mass of the neutron is
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Then
the equivalent of the speed of light.