When an object is placed 10 cm in front of a convex lens, the image form is real, enlarged and inverted.
What is a possible value for the focal length of this convex lens?

A. 4cm
B. 8cm
C. 10cm
D. 12cm

The answer says B. 8cm but why?? please explain to me clearly

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

The pressure proportional to the area a- inversely b- directly c- increase d-decrease