You have been hired to design a spring-launched roller coaster that will carry two passengers per car. The car goes up a 12-mm-high hill, then descends 18 mm to the track's lowest point. You've determined that the spring can be compressed a maximum of 2.2 mm and that a loaded car will have a maximum mass of 420 kgkg. For safety reasons, the spring constant should be 13 %% larger than the minimum needed for the car to just make it over the top. a) what spring constant (k) should you specify ?
b) What is the maximum speed of a 350 kg car if the spring iscompressed the full amount.

When an object is heated it contracts. a. true b. false

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

The table below shows the acceleration of gravity on different bodies in the solar system. on which body would a 10 kg lamp has the most gravitational potential energy when lifted to a height of 2 m? a. earth b. mars c. neptune d. uranus