The EPA requires treated tap water<span> to have a detectable </span>level of chlorine<span> to help prevent contamination. The allowable </span>chlorine <span>in </span>drinking water<span> (up to 4 parts per million) pose “no known or expected health risk [including] an adequate margin of safety.”</span>
Answer:
Object should be placed at a distance, u = 7.8 cm
Given:
focal length of convex lens, F = 16.5 cm
magnification, m = 1.90
Solution:
Magnification of lens, m = -
where
u = object distance
v = image distance
Now,
1.90 = 
v = - 1.90u
To calculate the object distance, u by lens maker formula given by:
u = 7.8 cm
Object should be placed at a distance of 7.8 cm on the axis of the lens to get virtual and enlarged image.
average velocity is vector displacement / time
time is "almost exactly one hour"
disp = -10m
v= -10/1x60x60 = -1/360m/s
Answer:
1995 and 2000 , 4 trillions
Explanation:
Answer:
Cruising at 35,000 feet in an airliner, straight toward the east,
at 500 miles per hour
Explanation: