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Alexus [3.1K]
3 years ago
8

PLS HELP

Physics
2 answers:
olasank [31]3 years ago
5 0
A, and C hope this helps u out.
RoseWind [281]3 years ago
4 0

Answer:

A and C are correct.

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Gravitational potential energy can be described as m*g*h (mass times gravity times height).

Originally,
15kg * 9.8m/s^2 *0.3 m = 44.1 kg*m^2/s^2 = 44.1 Joules.

After it is moved to a 1m shelf:
15kg * 9.8m/s * 1 = 147 kg*m^2/s^2= 147 Joules.

To find how much energy was added, we subtract final energy from initial energy:

147 J - 44.1 J = 102.9 Joules.
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9 0
3 years ago
Read 2 more answers
A 45.0-kg sample of ice is at 0.00°C. How much heat is needed to melt it? For water, Lf=334 kJ/kg and Lv=2257 kJ/kg 
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Heat required to change the phase of ice is given by

Q = m* L

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m = 45 kg

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In KJ we can convert this as

Q = 1.5 * 10^4 kJ

so the correct answer is D option

7 0
3 years ago
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