Aparallel-plate capacitor is constructed of two square plates, size l×l, separated by distance d. the plates are given charge ±q.
part a
what is the ratio ef/ei of the final electric field strength ef to the initial electric field strength ei if qis doubled?
part bwhat is the ratio ef/ei of the final electric field strength ef to the initial electric field strength ei if lis doubled? part cwhat is the ratio ef/ei of the final electric field strength ef to the initial electric field strength ei if d is doubled?

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this