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A ladder of length 20.0m is carried by a fire truck. The ladder has a weight of 2300N and its center of gravity is at its center. The ladder is pivoted at one end (A) about a pin (Figure 1) ; you can ignore the friction torque at the pin. The ladder is raised into position by a force applied by a hydraulic piston at C. Point C is a distance 8.0 m from A, and the force F→ exerted by the piston makes an angle of θ= 40o with the ladder.
What magnitude must F→ have to just lift the ladder off the support bracket at B?
A 1.0 kg ball is at rest on the floor in a 2.0 m x 2.0 m x 2.0m room of air at STP. Air is 80% nitrogen (N2) and 20%oxygen (O2) by volume. what is the thermal energy of the air in the room
Evangelista Torricelli was the first person to realize that we live at the bottom of an ocean of air. He correctly surmised that the pressure of our atmosphere is attributable to the weight of the air.
An RLC circuit consists of a 100 omh resistor, a 20 micro Coulomb capacitor, and a 400mH inductor connected in series with a 120V, What is the reactant of the circuit
A bicycle tire pump has a piston with area 0.44 in. If a person exerts a force of 30lbs on the piston while inflating a tire, what pressure does this produce on the air in the pump.
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. Find the speed of the wagon after the rock is thrown
A 5 kilogram mass attached to a horizontal spring is pulled from its equilibrium position by 2 meter and let go. find what is the maximum velocity of the mass
A hotel elevator ascends 273 meter with a maximum speed of 3.78 m/s. Determine how long does it take to make the complete trip from bottom to top
A gamma ray disappears in the process of creating an electron-positron pair. If the kinetic energies of the electron and positron are each 2.0 MeV, what was the energy of the gamma ray
A child moves with a speed of 5.40 m/s when positioned 14.0 m from the center of a merry-go-round. Calculate the net force (in newtons) exerted on the child, whose mass is 26.0 kg
A fully loaded semi-truck has a weight of 80,000 pounds. Let's take a theoretical truck and replace its engine with a 5.0HP engine and a suitable gear box to allow the engine to produce its rated power continuously. Estimate how long this trip wil..
A boat takes 3.20 hours to travel 30.0 km down a river, then 6.80hours to return. How fast is the river flowing
A 2.4 m long pendulum is released from rest when the support string is at an angle of 25° with the vertical. What is the speed of the bob at the bottom of the swing
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