quarterly earnings - Following sample data shows the quarterly earnings in millions for two US companies. Your research interest is (at .05 level of significance) determining if the average earnings for these companies are different. Justify your answer by doing a five step testing of hypothesis. Also, compute the p-value of the test. Company -1 Company -2 17.8 18.01 18 17.75 17.98 18 18....

Work and Kinetic Energy (6.82) - (See attached file for full problem description) --- Consider the system shown in the figure. The rope and pulley have negligible mass, and the pulley is frictionless. The coefficient of kinetic friction between the 8.00-kg block and the tabletop is . The blocks are released from rest. Use energy methods to calculate the speed of the 6.00-kg block aft...

Rotational Work and Kinetic Energy - A steel ball rolls down an incline into a loop-the-loop of radius R. (a) What minimum speed must the ball have at the top of the loop in order to stay on the track? (b) At what vertical height (h) on the incline, in terms of the radius of the loop, must the ball be released in order for it to have the required minimum speed at the top of the loop? (Neglect fric...

A mass falls and compresses a spring. Apply conservation of energy. - Mass M= 1.6 kg, released from rest, falls a distance h= 2.5 m then contacts a relaxed spring with unknown force constant k. The spring brings the mass to rest in compressing distance b= .52 m. Find the force constant of the spring.

Roller coaster , find normal force from track - Ans. is given as 731 N Please include basic explanations thanks