Because of an electron's high speed, which of its properties cannot simultaneously be measured with certainty? a. position and momentum
b. direction and charge
c. charge and momentum
d. position and charge

Which would not reduce the amount of green house gasses in the air

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?

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?