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A 8.90-m ladder with a mass of 24.4 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 261 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.68rad/s2 about an axis passing through the bottom end of the ladder. The ladder's center of gravity lies halfway among the top and bottom ends. (a) What is the net torque acting on the ladder? (b) What is the ladder's moment of inertia?
A particle with a mass of 3.00 10-20 kg is oscillating with simple harmonic motion with a period of 3.50 10-5 s and a maximum speed of 8.00 103 m/s. Calculate the angular frequency of the particle
For the third circuit, consisting of a single battery and two light bulbs in parallel, what is the total resistance of the circuit if each light bulb has a resistance of 7.7 ohms? What is the current through each bulb
police radars determine speed by measuring the doppler shift of radio waves reflected by a moving vehicle. the do so by
An electron of kinetic energy 1.56 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 21.8 cm. determine the circling frequency
A 40ton rail car and a 80ton rail car, initially at rest, are connected together with a giant but massless compressed spring between them. When released, What is the speed of the 40ton car relative to the ground
The longest "string" (a thick metal wire) on a particular piano is 2.0 m long and has a tension of 300.0 N. What is the total mass of the wire
A ball (m=1kg) is dropped from a height of 3 m. Assume no air resistance. After it bounces off the ground it only reaches a height of 2 m. What is the balls change in energy
What photon energy (eV) is required to excite the hydrogen electron in the innermost (ground state) Bohr orbit to the first excited orbit?
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 9.41 m to a store. The magnitude of the shopper's displacement from the bottom of the escalator to thestore is 16.0 m. The v..
A 921 kg car is moving rightward with a speed of 29.0 m/s. find the average resistive force acting upon the car
a 98-g piece of copper is heated in a furnace to a temperature tc. the copper is then inserted into a 150-g copper
An eagle with 1.8m wingspan flaps its wings 21 times per minute, each stroke extending from 42%u2218above the horizontal to 42%u2218 below. What's the average tangential velocity of the wingtip
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