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The latent heat of fusion for lead at 327.0 degrees c is 22.9 kj/kg and the specific heat of lead is 0.130 kj/kg degrees C. What is the energy needed to melt 100 grams of lead startingat 0 degrees C?

What is the specific latent heat of a substance having a mass of 10 kg and released an energy of 270000 KJ?

Two vectors A and B have precisely equal magnitudes. In order forthe magnitude of A + B to be 82 times larger than the magnitude ofA - B, what must be the angle between them? Please show the stepsusing the dot product method.


Thanks

8) Consider two vectors and where:

If we want to find the angle between these two vectors, we have two options: we can use the magnitude of the dot product, or the magnitude of the cross product.

• = AB cos()

= AB sin()

However, these approaches give conflicting answers for the value of .

a) What is the correct value of theta?

b) Why does the other formula give the wrong answer?

24 is 0.6% of what number?