Find the momentum of the bus (#5) if it has 60 passengers with a mass of 30 kg each and still moving at a velocity of 80 m/s east. (Hint: Find the total mass first, then calculate momentum).

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm