The muscles in arm 1 shown below are composed of 80% slow twitch and 20% fast twitch fibers. The muscles in arm 2 are composed of 20% slow twitch and 80% fast twitch fibers. Which arm would be able to perform the most repetitions with the 5 kg-dumbbell, and why?

Which situation will have the highest resistance? a.long wire and high temperatureb.short wire and high temperaturec.long wire and cold temperaturedshort wire and low temperature

How can you increase the strength of an electromagnet?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".