1. What is the gravitational potential energy of a 6 kg bowling ball placed on a shelf 2 m above the floor? g = 9.8 m/s^2

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

What are atoms of the same element with varying number of neutrons

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?