Help me at least with one exercise

Calculate:

a) The density of the gasoline knowing that a 500 L drum has a mass of 430 Kg.
b) The mass of a piece of glass with a volume of 10 cm3, knowing that the density of the glass is 2.2 g/cm3.
c) The volume of a steel ball of 14 g of mass if the dsteel = 5500 Kg/m3.
d) The mass of 1 L of olive oil (d= 0,85 g/cm3).

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?