Physics Assessmrnt - 850 Words

Question 1(10 marks) Comment the following statements (a) The volume coefficient of thermal expansion of water is negative for temperatures in the range 0 to 4  °C. (b) The triple point of water, 0.01  °C, and 611.73 Pa, is one of the primary fixed points on the Kelvin absolute temperature scale. (c) The volume coefficient for the thermal expansion of a solid is twice the linear coefficient for thermal expansion. (d) A temperature of 26.85  °C is the same as 300 K. (e) The surface temperature of the sun (3142  °C) is the highest temperature found in nature. Question 2 (10 marks) A sample of an unknown gas (gas A) has a volume of 3.2 m3 at a temperature of 10  °C. Another sample of an unknown gas (gas B) has a volume of 4.5 m3 at a†¦show more content†¦(b) What is the required capacitance of the defibrillator? Question 8 (15 marks) In a region of space there is a uniform magnetic field of magnitude 0.25mT pointing vertically straight down. (a) If an electron is moving in the horizontal plane at a speed of 550 kms−1, what will the radius of the resultant circular path be? (b) Will the electron be moving clockwise or counter-clockwise when viewed from above? (c) If a positron (same mass as an electron but with a charge of +qe ) is moving in the horizontal plane at speed of 550 kms−1, what will the radius of the resultant circular path be? (d) Will the positron be moving clockwise or counter-clockwise when viewed from above? (e) How fast would an ï  ¡ particle () need to be travelling to have a path of the same radius as the electron in part