How much work is done if a machine exerts 850 watts of power in 30 seconds? A) 28.3J
B) 283J
C) 2550J
D) 25,500J

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Which bonds are found inside a water molecule

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =