Can someone please help me answer this questions !!

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block