Question

PHY HW!

All of the Following Questions involve the same situation: You are on the Kingda Ka Il Coaster Design Team. It will be the world's fastest and highest roller coaster. The track design is similar in shape to the Kingda Ka, but larger and more powerful The project has been divided into two parts: SUPA HI: The launch, ascent, and first descent. SUPA G: Rounding the bottom of the big dip and going over the big hill. You are the Chief Conceptual Physicist on the SUPA HI team! You need to make sure that the ride is thrilling, can be withstood by typical humans, and is structurally sound. Among other things, the SUPA HI engineers need to know how large the forces will be on the launch cable, passenger train, and tower so that they can be designed to not break apart! A key engineering concern is that not be possible to build a passenger train that is strong enough without being too heavy. There are similar concerns about the tower. may Design Parameters: Track Material: Carbon fiber reinforced aluminum Passenger Train Wheels: Steel base with polyurethane outer layer Maximum power delivered to passenger train at launch = 20.2 MW Maximum speed at launch = 87.1 m/s - 195 mph! (purely horizontal) Time to get from zero to 87.1 m/s is 3.69 seconds Elevation of launch platform = 3.80 m Elevation of top of track = 309.60 m-1000 feet! Loss of height during first descent = 301.00 m Speed at bottom of first descent = 66.4 m/s = 149 mph (purely horizontal) Time to get from maximum launch speed to bottom of first descent = 19.6 s

Answer 1

Q1

For normal force on a flat surface:

Always greater than the force of gravity: FALSE

Proportional in magnitude to net frictional force: TRUE

Parallel to net frictional force: FALSE

Perpendicular to net frictional force: TRUE

Always equal to the force of gravity: FALSE

Zero for a roller coaster descending a steep slope at constant velocity: FALSE

Always less than the force of gravity: FALSE

Zero for an object in free fall: There is no force in this case.

Parallel to Surface: FALSE

Perpendicular to a surface: TRUE

Q2

Zero for an object in free fall: There is no force in this case.

Always less than the force of gravity: FALSE

Parallel to the normal force: FALSE

Always greater than the force of gravity: FALSE

Perpendicular to a normal force: TRUE

Zero for a roller coaster descending a steep slope at constant velocity: FALSE

In same direction as motion: FALSE

Directly oppose the direction of motion: TRUE

Proportional in magnitude to a normal force: TRUE

Always equal to the force of gravity: FALSE