This diagram shows two different forces acting on a skateboarder. The combined mass of the skateboard and the person is 72.3 kg. Based on this
information, what is the acceleration of the skateboarder?
Air resistance = 7.20 N
Applied force = 77.40 N
A. 0.97 m/s2 to the left
B. 0.97 m/s2 to the right
C. 3.21 m/s2 to the left
D. 3.21 m/s2 to the right

Use the empirical rule. the mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 66 miles per hour and 74 miles per hour. (assume the data set has a bell-shaped distribution.)

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?