PHY191 Email: bbcnoun@gmail.com Whatsapp: 08131667008 Errors arising from arithmetic miscounting a number of periods, faulty electrical contacts, wrong scale reading are Answer: erratic errors The total kinetic energy possessed by cylinder rolling down an inclined plane given as Answer: â1/2 mv2 + â1/2iw2 If a plane is inclined at an angle 5o with the horizontal and a cylindrical metal is allowed to roll between two fixed height 92cm apart on the plane. Given that the acceleration of the cylinder to be (2gSinW3) and g as 9.8m/s2, the time of descent i Answer: 1.809 secs The error that may be present when varying values of time are obtained 30 times for a rolling metal cylinder down an inclined plane between two fixed points on the plane using a stop-watch is Answer: systematic error If a plane is inclined at an angle 5o with the horizontal and a cylindrical metal is allowed to roll between two fixed height 92cm apart on the plane. Given that the acceleration of the cylinder should be (2gSinθ/3). [Take g as 9.8m/s2] What is the acceleration of the cylinder Answer: 5.7x10-1 m/s2 Six measurements were made of the time in seconds for 20 oscillations of a mass hung from a spiral spring as follows: 20.1,20.2, 20.3, 20.1, 20.0, 20.2.The standard error is Answer: 2.5x10-3 A straight line graph equation of the form y mx has a Answer: positive slope A straight line graph equation of the form y mx will always have plotted points Answer: passing through the origin Periodic time of a simple pendulum depends on Answer: the length of the pendulum Errors arising from various individual judgements in estimating scales, fluctuating conditions in temperature, pressure, voltage measurements and inhomogeneity of material measured are Answer: random errors Errors which affect measurements in a regular way or in some constant proportion such as instrument errors arising from faulty instruments are Answer: systematic errors If the time of descent of a rolling cylinder on a plane inclined 10o to the horizontal is 3.35 seconds. What is the distance covered by the rolling cylinder, if the acceleration of the cylinder is given as (2gSinî/3)? [Take g = 10 m/s2]. Answer: 649cm In testing for errors in a set of data, if the difference between the Experimental value (mean of the set of data) and the theoretical value is greater than three times the standard error, it may be an indication of Answer: systematic error The type of error present if three or more observers carrying out an experiment separately and using the same set of instruments obtained different sets of values is Answer: random error A set of readings that is close to the “true valueâ€? is said to be Answer: accurate Express 0.0450312 in 3 significant figures Answer: 0.045 rolling cylinder at the upper fixed point on the inclined plane possesses Answer: potential energy Six measurements were made of the time in seconds for 20 oscillations of a mass hung from a spiral spring as follows: 20.1,20.2, 20.3, 20.1, 20.0, 20.2. The mean value of the period of oscillation is Answer: 1.0075 Metal cylinder was rolled down 30 times from an inclined plane between two fixed points on the plane using a stop-watch, if the stop-watch is working fine, but varying values of descent are still being observed, then it is likely due to Answer: random error A rolling cylinder is in a motion of two types namely, Answer: translational & rotational Email: bbcnoun@gmail.com Whatsapp: 08131667008