Explain why a scientific theory can never be proven. If that is true, are scientific theories no better than guesses?

23. In the class demonstration, when viewed through the diffraction gratings, the tubes of gas excited by a high voltage source emitted

4. List two reasons that a bigger telescope is better than a smaller telescope.

27. Diffraction (the bending of light around corners) limits the ______ of a telescope.

28. Adaptive optics are used to correct which of the following problems?

22. An electron emits a ______ when it transitions from a higher energy level to a lower energy level in an atom?

Assume that  x  and  y  are both differentiable functions of  t  . Find  when  and  for the equation. ​

An airplane flies at an altitude of 6  miles towards a point directly over an observer. Consider  and  as shown in the following figure. The speed of the plane is400 miles per hour. Find  when  miles. Round your answer to three decimal places. ​ ​

Find the points at which the graph of the equation has a vertical or horizontal tangent line. ​ ​

A petrol car is parked 40 feet from a long warehouse (see figure). The revolving light on top of the car turns at a rate of 30 revolutions per minute. Write  as a function of x. ​ ​