A real image twice the size of an object is formed by a concave mirror when the mirror and the object were shifted the mirror formed become four times the size of the object find the focal length of the mirror if the image were to be shift by 24cm Hint; in the first position of the object U = V/F -1 apply this to the second position​

This is the substance(s) formed in a chemical reaction.

Ain is , is 's of ? 0.62 0.79 1.27 1.50

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 .