The north and south poles of a magnetic field produced by an electromagnet will switch when the direction of the changes.

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?

In an experiment, how can i change human errors? be specific.

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above