What is the minimum amount of energy required to completely melt a 6.92 kg lead brick which has a starting temperature of 15.1°C? The melting point of lead is 328°C. The specific heat capacity of lead is 128 J/(kg C°); and its latent heat of fusion is 2.32×104 J/kg.

Calculate the minimum amount of energy, in joules, required tocompletely melt 120 g of silver initially at 13.0°C.

ANS must be in J
HINT :
Did you note that the temperature did not change—this is just amelting problem? How is the thermal energy related to the heat offusion (the stuff melts) and the mass?

at a foundry, 22 kg of molten aluminum with a temperature of660.4degrees celsius is poured into a mold. if this is carriedoutin a room containing 150 kg of air at 24 degrees celsius, whatisthe temperature of the air after the aluminum iscompletelysolidified? assume that the specific heat capacity of airis1.0x10³ J/kg. the specific heat of aluminum is 899J/kgand latent heat of fusion of aluminum is 3.97x10⁵J/kg.answer in units of degrees celsius.

A 0.0500-kg lead bullet of volume 5.00 × 10-6 m3 at 20.0 °C hits ablock that is made of an ideal thermal insulator and comes to restat its center. At that time, the temperature of the bullet is 327°C. Use the following information for lead:

coefficient of linear expansion: a = 2.0 × 10-5/C°
specific heat capacity: c = 128 J/(kg • C°)
latent heat of fusion: Lf = 23 200 J/kg
melting point: T melt = 327 °C

How much heat was needed to raise the bullet to its finaltemperature?
A) 963 J B) 1930 J C) 3640 J D) 3880 J E) 4440 J