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An 18kg object is pulled by a force of 210N, 40° with the horizontal. The coefficient of kinetic friction of the object is given as 0.45. What is the acceleration of the object?
A simple pendulum has a mass of 0.250 kg and a length of 1.00 m. It
is displaced through an angle of 15.0° and then released. What are (a)
the maximum speed, (b) the maximum acceleration, and (c) the
maximum restoring force? What If? Solve this problem by using the
simple harmonic motion model for the motion of the pendulum, and
then solve the problem more precisely by using more general
principles.
.A Christmas ball in a shape of a hollow sphere is hung from the tree by a piece of thread attached to the surface of the ball. The mass and radius of the ball are 0.105kg and 0.12m, respectively. What will be its period of oscillation when slightly displaced from its equilibrium position?
A 85-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 9.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.50 s, what is the magnitude of the average horizontal force by diver on the raft?
A 5kg object is hanging by a 1.5m wire when it is suddenly hit by a 3kg missile traveling horizontally at 12m/s. The missile embeds itself in the object during the collision. What is the tension in the rod immediately after the collision?
When the speed of a fluid flowing in a pipe increases, what happens to the internal
pressure in the fluid?
Why is it that an aneroid barometer is able to measure altitude as well as atmospheric
pressure?
When you drink liquid through a straw, it is more accurate to say that the liquid is
pushed up the straw rather than sucked up the straw. What exactly does the pushing?
Explain.
What is the mass of a cubic meter of air at 20oC at sea level?
How does the density of gases at different elevations in the atmosphere differ from the
density of liquids at different depths?
