Which of the following is a general difference between a planet and a star? a)all planets are made of rock and all stars are made of gas. b) planets are brighter than stars. c)planets are larger than stars. d)stars glow in infrared and visible light, while planets glow only in the infrared.

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.