How can the power of an object required to lift a mass up a height be increased ? A .reduce the height
B .reduce the mass
C .increase the time
D .reduce the time

How many astronauts have walked on the moon?

Ajogger runs 5.0 km on a straight trail

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate