For a before race of the exactly one mile, is the horse\'s time \"directly\" or

Question

For a before race of the exactly one mile, is the horse's time "directly" or "inversely" proportional to the average speed? Energy and mass are completely equivalent in the sense that mass can be converted (changed) into energy and energy can be converted into mass. (True/False)___ Measurements of time and space are relative, and depend upon the speed of the observer, but the speed of the light in vacuum is an absolute, not relative to anything. (True/False)___ Judy, a 21 year old red haired girl, leaves Earth on a rocket ship traveling at .999c, leaving her identical twin sister Jane behind on Earth. Judy travels to a distant star where she meets handsome alien and has a good time. She then returns to Earth and is reunited with Jane. At the reunion one of the twins appears to be a healthy 23 year old red head while twin is an older lady with white hair. Which twin has write hair? ____ A clock and a ruler shoot by you at relativistic speeds. The ruler appears to be too short and the clock seems to be running too slow. (True/False) ____ A water wave has a frequency of 5 cycles/see and a wavelength of 2 meters. What is the wave velocity? ____ A wave which is transmitted from one uniform medium to another will (once it is inside the second medium) undergo: a) reflection, b) reflection, c) diffraction. ____ The distance between successive wave crests is called the ____ The units measuring number of cycles per second are called (use the full word) ____ Mass produces gravitational fields. In the same sense, what basic quantity, even when it is not moving or changing, produces an electronic force? (Do not answer "electric field, electric potential" or "an electromagnetic wave") Two gamma ray photons collide. A photon has zero electric charge. After the collision the photons have disappeared and two particles have been created. What will be the net electric charge of the particles? a) b) zero, c) negative. Give a definition (an equation) for electric potential, V, in of electric potential energy, EPE. A 9 volt battery discharges through a 36 ohm resister. What is the current through the resister?____

Explanation / Answer

23. average speed = distance / time

Ans: Inversly

24. True

25. True

26. Twin that remains on the earth.

27. True

28. v = wavelength x frequency = 2x 5 = 10 m/s

29. (a) refraction

30. wavelength

31. Hertz

32. charge
33. (b) zero

34. V = EPE / q

35. I = V / R = 9 / 36 = 0.25 A

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