Question 6 The motion of a car is given by a = t* – 5t² + 7, where a is the acceleration in m/s2 and t is the time in seconds. The velocity of the particie att = 2 seconds is 8.45m/.se, and the displacement is 10.45 metres. Calculate the displacement and the velocity at t=4 seconds (20mks)

International Edition---engineering Mechanics: Statics, 4th Edition
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Chapter7: Dry Friction
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Question 1
Will the force of 18O N cause the 100 kg to slip if the coefficiert of friction is 0.15 (20mk).
100 x BA-80 N
N.
Question 2
A pulley of mass of 55 kg is suspended plane as a compound pendulum. The distance of centre
of gravity from the knife edges suppert is 150 mm and the pulley makes 150 oscillations in 155
secands. Find the moment of inertia of the flywheel through the centre of gravity (20mks)
Question 3
A sphere of mass 100kg moving at 3mls overtakes and collides with ancther sphere of mass 75kg
moving at 2.6 m/s in the same direction. Find the velocities of the two masses after impact and
loss of kinetic energy during impact in the following cases:
(i)
When the impact is inelastic (10mks)
When the impact is elastic (10mks)
(ii)
Question 4
The uniform rod having a weight W and length Y is supported at its end C and D, where the
coefficient of friction is µ. Determine the greatest angle 0 so the rod coes not slip. Neglect the
thickness of the rod for the calculation (20mks).
D.
Question 5
(a). A body resting on a rough horizontal plane requires a pull of 400 N inclined at 60° to the
plane just to move it. It was found that a push of 275 N inclined at 600° to the plane just moved
the body. Determine the weight of the body and cosfficient of friction (10mks)
Transcribed Image Text:Question 1 Will the force of 18O N cause the 100 kg to slip if the coefficiert of friction is 0.15 (20mk). 100 x BA-80 N N. Question 2 A pulley of mass of 55 kg is suspended plane as a compound pendulum. The distance of centre of gravity from the knife edges suppert is 150 mm and the pulley makes 150 oscillations in 155 secands. Find the moment of inertia of the flywheel through the centre of gravity (20mks) Question 3 A sphere of mass 100kg moving at 3mls overtakes and collides with ancther sphere of mass 75kg moving at 2.6 m/s in the same direction. Find the velocities of the two masses after impact and loss of kinetic energy during impact in the following cases: (i) When the impact is inelastic (10mks) When the impact is elastic (10mks) (ii) Question 4 The uniform rod having a weight W and length Y is supported at its end C and D, where the coefficient of friction is µ. Determine the greatest angle 0 so the rod coes not slip. Neglect the thickness of the rod for the calculation (20mks). D. Question 5 (a). A body resting on a rough horizontal plane requires a pull of 400 N inclined at 60° to the plane just to move it. It was found that a push of 275 N inclined at 600° to the plane just moved the body. Determine the weight of the body and cosfficient of friction (10mks)
Question 6
The motion of a car is given by a = t* – 5t2 + 7, where a is the acceleration in m/s2 and t is the
time in seconds. The velcity of the particle att = 2 seconds is 8.45m/.se, and the displacement is
10.45 metres. Calculate the displacement and the velocity at t =4 seconds (20mks)
Transcribed Image Text:Question 6 The motion of a car is given by a = t* – 5t2 + 7, where a is the acceleration in m/s2 and t is the time in seconds. The velcity of the particle att = 2 seconds is 8.45m/.se, and the displacement is 10.45 metres. Calculate the displacement and the velocity at t =4 seconds (20mks)
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