Why do the north and south poles of these magnets attract each other? A. The magnetic fields of the two magnets repel each other. O O O
B. They have two different magnetic fields.
C. The opposite magnetic poles of the two magnets face each other.
D. They have opposite electrical charges.

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class

If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y − 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t − 1.