choose correct 1 sound travels faster in materials that are a) highly compressible and very dense b) least compressible and very the tendency c) least compressible and less dense d) highly compressible and less volume

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

=force × distance a. work b. velocity c. pressure d. momentum

Which of the following are appropriate acceleration units?