6. Which of the following statements is/are true?*

A concave lens has 4 dioptre power having a focal length 0.25 m
A convex lens has 4 dioptre power having a focal length 0.25 m
A concave lens has - 4 dioptre having a focal 0.25 m
A convex lens has -4 dioptre power having a focal length 0.25 m

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.