Answer:
Explanation:
The magnetic field 0.02 m from a wire is 0.1 t. what is the magnitude of the magnetic field 0.01 m from the same wire?
2 answers:
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The amount of energy needed to melt the ice is 1670 J
Explanation:
The amount of thermal energy needed to completely melt a certain amount of solid substance (already at melting point) is given by
where
m is the amount of the substance
is the specific latent heat of fusion of the substance
Here, the mass of the ice is
m = 5 g = 0.005 kg
And the specific latent heat of fusion of ice is
Assuming that the ice is already at melting point, the thermal energy needed to melt the ice is
Learn more about specific heat:
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Hello!
We know that at the BOTTOM of the pendulum's trajectory, the bob has a maximum speed. This means that its KINETIC ENERGY is at a maximum, while its Gravitational POTENTIAL ENERGY is at a minimum.
On the other hand, when the bob is at its highest points, the bob has a velocity of 0 m/s, so its KE is at a minimum and its PE is at a maximum.
We can use the work-energy theorem to solve. Let the Initial Energy equal the bob's energy at one of the sides, while the final Energy equals the bob's energy at the bottom.
Recall that:
PE = mgh
m = mass (kg)
g = acceleration due to gravity (m/s²)
h = height (m)
KE = 1/2mv²
m = mass (kg)
v = velocity (m/s)
Set the two equal and solve for 'h'.
Cancel mass.
Solve for 'h'.