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A 4.0-m-long iron bar of uniform cross section is held perpendicular to the wall by a wire from the end of the bar to the wall as shown below. If the iron bar weighs 636 N and the wire is 5.0 m long, what is the magnitude of the vertical component of force produced by the wall?
A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 3.5 kg*m^2. Calculate the initial and final kinetic energy of the system
An automobile having a mass of 1,000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with constant 5.55 106 N/m, What was the speed of the car before impact
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
A circular disk with a radius of 0.65 meters and mass of 0.26 kg has a hole cut in the middle.
What is tension T in each of the cables
Calculate the gravitational force on a spacecraft 8700km above the Earth's surface if its mass is 1200kg
The isotope ^(99)Tc* is commonly used in several different types of medical imaging procedures. find the change in the nuclear mass after emission of the gamma ray
A large optical telescope with an aperture of diameter 2.6 m is used to study the Moon. What is the size of the smallest feature on the Moon
The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. What is the pilot's apparent weight at the lowest point if his true weight is 160 lb
Assume charge builds up on the cloud and on the ground until a uniform electric field of 4.00 multiplied by 106 N/C throughout the space between them makes the air break down, What is the maximum charge the cloud can hold
A hydraulic lift consists of two pistons that connect to each other by an incompressible fluid. If one piston has an area of 0.49 m^2 and the other an area of 6.2m^2, how big a mass can be raised by a force of 220N exerted on the smaller piston.
A physics lecture room has a volume of 254 m3. For a gas pressure of 1.00 atm and a temperature of 27.0 oC, use the ideal gas law to estimate the number of air molecules in the room
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