Asmall boat is headed for a harbor 30 km directly northwest of its current position when it is suddenly engulfed in heavy fog. the captain maintains a compass bearing of northwest and a speed of 9.6 km/h relative to the water. the fog lifts 3.0 h later and the captain notes that he is now exactly 4.2 km south of the harbor. (a) what was the average speed of the current during those 3.0 h?

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?