PLS HELP (ASAP) Acutely give me the answer no links

There is a box on your desk that
acts as a paperweight. Its
measurements are 1 cm by 3 cm
by 7cm. The block has a mass
of 220.5g. What is the
substance?

Which of the following energy forms are invovled in a nuclear power plant ? heat ,sound , electrical , nuclear ,mechanical

The extremely high temperatures needed to trigger nuclear fusion are proposed to be generated by laser irradiating a spherical pellet of deuterium and tritium fuel of diameter 1.8 mm. (a) determine the maximum fuel temperature that can be achieved by irradiating the pellet with 200 lasers, each producing a power of 550 w. the pellet has an absorptivity 0.3 and emissivity 0.8.

Why do electron microscopes have higher resolving power than light microscopes?