Mechanics | Relativity Answers

In an experiment to determine the period of oscillation of a loaded spiral spring, which of the following is NOT a necessary precaution?

A. using small vertical displacements from equilibrium position to set the system in oscillation
B. repeating the timing of oscillations and finding the average
C. using small angular displacements from equilibrium position to set the system in oscillation
D. counting down to zero to start the stop watch in the timing of the oscillations

The resultant of vectors A and B and is perpendicular to A and has the magnitude 24 units. If the sum of
magnitudes of A and B is 32 units, then their individual values may be

(a) What is the magnitude of the force of gravity between Earth and Jupiter (take mass of Earth
ME = 6.00 1024 kg,
mass of Jupiter
MJ = 1.90 1027 kg,
and the distance between their centres
REJ = 5.89 108 m)?

b)At what point between Earth and Jupiter is the net force of gravity on a body by both Earth and Jupiter exactly zero?

when an automobile moves with constant speed down a highway,most of the power developed by the engine is used to compensate for the mechanical engine loss due to frictional forces exerted on the car by the air and road. if the power developed by engine is 175hp,estimate the total frictional forces acting on the car when it is moving at a speed of 29 meter per sec. One horsepower equals 746 W.

The slope of the graph of T2 plotted on the vertical axix against l on the horizontal axis is used to determine the value of....

A. Frequency
B. Period
C. Phase
D. Acceleration due to gravity

In an experiment to verify Newton's law of cooling, the temperature of hot water in a calorimeter $ T/^{0} C $ is plotted against time t/min. Which of the following is true about the graph?

A. The graph is linear and parallel to the T-axis
B. The slope of the graph is positive
C. The slope of the graph is negative
D. The graph is hyperbola

Which of the following is NOT true in the experiment to determine the acceleration due to gravity by means of a simple pendulum from inaccessible height, where h is the height of the bob from the floor and H the inaccessible height

A. The intercept on the T2 axis for T2 plotted against h gives the inaccessible height
B. The graph of T2 against h is linear
C. The slope of T2 plotted against h is negative

In an experiment to determine the acceleration due to gravity g, T2 was plotted on the vertical axis and I on the horizontal axis. The value of g is obtainable from

A. intercept on T2 axis
B. intercept on I axis
C. Inverse of the ratio T2/I
D. Slope of the graph

A fisherman has caught a very large, 5.0 kg fish from a dock that is 2.0 m above the water. He is using lightweight fishing line that will break under a tension of 56 N or more. He is eager to get the fish to the dock in the shortest possible time.

A string is wound around a wheel of radius 20 cm. How large is the angle through which the wheel must turn to unwind 30 cm of the string?