List the order by which an electromagnet operates: A. metal wire = = > Magnetic field = = > Electric current

B. Magnetic Field = = > loops of wire = = Electric Current

C. Electric current = = > Compass = = > Magnetic Field

D. Loops of Wire = = > Electric current = = > Magnetic Field

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.