Ishan and Adil are at an amusement park and want to ride the Slingshot, a ride that uses steel cables and springs to vertically accelerate riders in an attached metal cage. The springs ensure the steel cables are taught the entire time. After the ride is over, Ishan and Adil check their cellphones and find their built in altimeters recorded a maximum height of 110 m above their starting point, and the accelerometers recorded a maximum acceleration of 14.3 m/s2 . For the following, model the ride as a simple harmonic oscillator and ignore air resistance and frictional forces. Required:
a. What was the maximum speed they experienced during the ride?
b. If the ride lasted for 5 full oscillations, how long did it last from start to finish?

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?