A wire has a current flowing through it as shown in the figure, What is the direction of the magnetic
field at point "A?
a ( into the page )
b ( left)
c ( out of the page )
d( down )

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?