During a certain time interval, a 20-n object free-falls 10 meters. the object gains joules of kinetic energy during this interval

200 J

Explanation:

By the law of conservation of energy, the kinetic energy gained by the object during the fall is equal to the loss of gravitational potential energy:

The loss of gravitational potential energy of the object over a distance of 10 m is given by:

where

(mg) = 20 N is the weight of the object

h = 10 m is the loss in height

Substituting, we find

So, the kinetic energy gained by the object is

helium

oxygen

neon

sodium

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.