John does 150 Joules of work in 50 seconds. Lisa does 200 Joules of work in 20 seconds. How much power does each person require? Who was more powerful?

Explain vector addition, triangle method and parallelogram method

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.

Ahurricane sweeps across the ocean and damages the houses of people living along the coast. which of these does not play any role in this interaction? air water glaciers living things