Hi please if anyone good in physics, if he/she can help meee please

Help mee and i will give you brainiliest
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A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Calculate the volume of this regular solid. what is the volume of the cone? round your answer to the nearest hundredth

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.