stretchable cord mean for a jumping right is being tested weight of 800 N is attached to one end of the cord then the way is released from a tall tower and then moves downward when the cord is fully stretch it exerts an opposing force of 900 N on the weight

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

Answer fast for brainliest an optical telescope is an instrument that collects and reflects light from distant objects focuses light from very small objects stores heat from distant objects focuses light from distant objects