\if an object is placed at twice the focal length of a convex lens, where is the image located on the other side of the lens?
question 2 options:

1 f

2 f

3 f

0.5 f

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in