A car slides on an icy street with no friction. It strikes a stationary car of the same mass. After the collision, the first car moves off with speed 7.5 m/s at an angle of 35o with respect to the original line of motion, and the second car moves off at an angle of -15o with respect to the original line of motion of the first car. Assuming there is no friction after the collision, find the speed of the first car before the collision.

The weights of bags filled by a machine are normally distributed with a standard deviation of 0.05 kilograms and a mean that can be set by the operator. at what level should the mean weight be set if it required that only 1% of the bags weigh less than 9.5 kilograms? round the answer to 2 decimal places.

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?