PHY191
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: 5.7×10-1 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: 2.5×10-3
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 value? 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
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