Why can't sound be heard when the phone playing music is placed inside the vacuum jar? Explain what you think is happening.

Ablock of mass 1.5 kg slides down an inclined plane that has an angle of 15. if the inclined plane has no friction and the block starts at a height of 3 m, how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2. a. 6.8 j b. 50.9 j c. 0 j d. 44.1 j

If you held a stone over the mouth of a well and then let it go , what would happen to the stone? explain your answer.

Why do some scientists and archeologists think that volta was not the first person to build a battery