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Q. A person is trying to move a dresser by pushing it with a horizontal force applied at a height above floor. The dresser has mass, length and height. The coefficient of kinetic friction between dresser and the floor is and is the acceleration because of gravity. The floor exerts upward normal forces with magnitudes and where the dresser's legs rest on the floor. Note that this is a 2-dimensional problem.
Q. Given an angular speed omega, find out the radius R (omega) at which the mass rotates without moving toward or away from the origin.
Starting from rest, a 98 kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 800N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole.
Consider an angular motion. If the displacement is given as 250teθ, and the radius r is constant, derive the expressions for the angular velocity θ=ω, angular accelerationα, linear displacements, linear velocitytv, normal accelerationna, and tange..
When the Sun is straight overhead, a hawk dives toward the ground with the constant velocity of 4.50 m/s at 52° below the horizontal. Compute the speed of her shadow on the level ground.
A speed skater moving across frictionless ice at 8.4 m/ s hits a 5.2 m -wide patch of rough ice. She slows steadily, after that continues on at 6.3 m/s.
A stone of mass 0.31 kg is tied to a string of length 0.85 m and is swung in the horizontal circle with speed v. The string has a breaking-point force of 90 N. What is the largest value v can have without string breaking.
How long does it take for the last car to come to rest. When catching a baseball, a catcher's glove moves by 11 cm along the line of motion of the ball. If the baseball exerts a force of 403 N on the glove, how much work is done by the ball.
A 131 kg sign hangs between two buildings by two cables. Cable 1 is attached at a 36 degree angle wrt to the horizontal, and Cable 2 is attached at a 24 degree angle wrt to the horizontal. What is the tension in cable 1.
If astronauts could travel at v = 0.950 c, we on Earth would say it takes (4.20 / 0.970) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree. How much time passes on astronauts' clocks? What is the distance to Alph..
State the amplitude of the electric field vector in micro volts per meter to three significant figures.
Many communications satellites orbit the earth in geostationary orbits. (They appear to remain in the same positions in the sky for observers on the earth's surface.) If such a satellite orbits at a height of 40,000 km, estimation the time delay in a..
How far below the top of the well is the surface of the water. If you ignored the travel time for the sound, what would have been the calculated depth.
How far must it now sail to reach its original destination. find the potential energy of the system.
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