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Questions in physics

[Homework Help] You see an advertisement for a new free fall ride at an amusement park. The ad says the ride is 50 meters tall and reaches a speed of 28 m/s at the bottom. How efficient is the ride? *Hint: You can use any mass you wish because it cancels out.*

[Homework Help] What does "local acceleration" mean?

[Homework Help] If I push on a wall with a force of 3500 N for 5 hours but the wall does not move, how much work have I done?

[Homework Help] A 4.0-kilogram ball moving at 8.0 m/s to the right collides with a 1.0-kilogram ball at rest. After the collision, the 4.0-kilogram ball moves at 4.8 m/s to the right. What is the velocity of the 1.0-kilogram ball?

[Homework Help] How do u work out weight c and d and what r the answers

[Homework Help] What is required to cause acceleration?

[Homework Help] An 800 kg roller coaster starts from the top of a 45 m hill with a velocity of 4 m/s. The car travels to the bottom, through a loop, and continues up the next hill. The end of the roller coaster has a level surface that is 4 m off the ground. Assume there is no friction on the roller coaster ride and energy is conserved. 1. How tall is the hill if the roller coaster is traveling at 10 m/s at the top of it? 2. What will be the velocity of the roller coaster at the top of the loop?

[Homework Help] How do you find the coefficient of kinetic friction?

[Homework Help] Can you help me fill in the blank? _______ waves are used to penetrate solids and are used in doctors' offices and at airports.

[Homework Help] If the speedometer on a car indicates a constant speed, can you be sure the car is not accelerating?