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A 9.91 -m ladder with a mass of 22.3 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 257 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.88 rad/s2 about an axis passing through the bottom end of the ladder. The ladder's center of gravity lies halfway between the top and bottom ends.
(a) What is the net torque acting on the ladder?
(b) What is the ladder's moment of inertia?
Two runners start simultaneously from the same point on a circular 200-m track and run in the same direction. How far from the starting point will each have run at that instant
In one of the original Doppler experiments a tuba was played on a moving flat train car at a frequency of 75 hz, What beat frequency was heard if the train car approached the station at a soeed of 10m/s
A simple harmonic oscillator has an amplitude of 5cm, a spring constant of 5.0N/m, and a maximum speed of 10 m/s. What is the speed when it reaches half of the amplitude
a child is born after 39 weeks in its mothers womb. if the childs birth mass is 3.5kg, how much mass on average does the fetus gain each day in the womb
A conductor bar ab of length 0.6 m is moving on two conducting rails with a speed v = 3.6 m/s perpendicular to a uniform magnetic field of B = 0.35 T. find the electromotive force in the bar
One particle has a mass of 4.41 x 10-3 kg and a charge of +6.92 ?C. A second particle has a mass of 6.52 x 10-3 kg and the same charge. Find the initial separation between the particles
A 890kg sports car collides into the rear end of a 2500kg SUV stopped at a red light. The bumpers lock, calculates the speed of the sports car at impact
a race car is approaching a jump ramp with the ramp angle at 10 degrees and 20 meters long and is 3.47 meters off the ground, what is the minimum velocity the car can go to make the jump
If the energy that goes into evaporating one kilogram of water from Lake Michigan at 22.0 oC, how high (in m) would it be lifted
what is its kinetic energy at the end of the interval. How high a tree would a 80 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount.
find the mass defect (in u) for (a) helium-3 (2He3), which has an atomic mass of 3.016 030 u, and (b) the isotope of hydrogen known as tritium (1T3), which has an atomic mass of 3.016 050 u.
An AC adapter for a telephone-answering unit uses a transformer to reduce the line voltage of 120 V (rms) to a voltage of 10.0 V. What is the rms power delivered to the transformer
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