A Foucault pendulum consists of a brass sphere with a diameter of 32.0 cm suspended from a steel cable 11.5 m long (both measurements made at 20.0∘C). Due to a design oversight, the swinging sphere clears the floor by a distance of only 3.00 m when the temperature is 20.0∘C. At what temperature will the sphere begin to brush the floor?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Ineed the answer to question 1 , i’m desperate

Which of the following are guidelines to follow for obtaining accurate observations