at what height is an object that has a mass of 50 kg, if its gravitational potential energy is 9,899 Joule? g= 9.8/10 can u do it with both gravitational acceleration ​

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Which levels of government establish and implement educational requirements for minors

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.