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time. The velocity of the first airplane is
710 m/h at a heading of 20.7
à ¢ ¦
. The velocity
of the second is 560 m/h at a heading of 107Ã ¢ ¦
.
How far apart are they after 1.8 h?
1) FIGURE 1 shows a uniform ladder PQ of weight 240 N leans on a smooth wall and
resting on a rough floor with a minimum inclination angle θmin. The coefficient of
friction between the ladder and floor is 0.25.
(i)
With the aid of a force diagram, calculate the forces acting on the ladder at
point P and point Q.
(ii)
Determine the value of θmin.
A 200 N wagon is to be pulled up a 30 degrees incline at a constant speed. How large a force in kN parallel to the incline is needed if friction effects are negligible?
Spring is compressed to a length of 20 cm by a 20 kg object on a 20 degrees inclined surface with coefficient of kinetic friction 0.30. What is the initial velocity of the object moving up the plane? The spring constant is 980 N/m
An 30 kg object from rest was pulled horizontally by a pulling force of 100N applied along the direction of displacement line. The coefficient of kinetic friction between the surface and the object is 0.20 and the object was displaced at a distance of 40 meters. How work is done on friction?
Two beakers of water, A and B, initially are at the same temperature. The
temperature of the water in beaker A is increased 10 F°, and the temperature
of the water in beaker B is increased 10 K. After these temperature changes,
which beaker of water has the higher temperature? Explain.
