A 1250 kg truck at rest takes 8.75 seconds to speed up to 45.3 m/s. What is the force produced by the engine?

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?

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

When an object is heated it contracts. a. true b. false