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A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. The string rotates at an angular speed of 45 rev/s, and its tip has a tangential speed of 52 m/s. What is the length of the rotating string?
A glass window 0.45cm thick measures 90cm by 35cm . If the inside and outside temperatures differ by 18?, By what factor is the rate of heat transfer reduced
A proton moves perpendicularly to a uniform magnetic ?eld B with a speed of 1.9 × 10 ^7 m/s and experiences an acceleration of 8 × 10 12 m/s 2 in the positive x direction when its velocity is in the positive z direction. The mass of a proton is 1...
The pulley system is used to lift a 52 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to crate. assume the masses of the chains, pulleys, and ropes are negligible, conclude the forc..
a 760 kg light weight helicopter ascends from the ground with an acceleration of 2.5m/s^2. what is the work done by the lifting force
A certain lightbulb has a tungsten filament with a resistance of 18.0 when cold and 138 when hot. Find the temperature of the hot filament
Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 40cm diameter Styrofoam sphere in water? Assume the volume of the mass is negligible compared to that of the sphere.
A 75-kg piece of metal has specific heat 430 J/kg°C and is initially at 950°C. To cool it down, it is dunked into 710 kg of oil that has a temperature of 32°C and specific heat of 2700 J/kg°C. Assuming that heat flows only between the oil and the m..
The output voltage of an AC generator is given by ?v = (120 V) sin (80?t). The generator is connected across a 21.0-? resistor. Find the maximum current in the resistor
An airoplane takeoff speed is 320km/h. if its average acceleration is 2.9m/s^2, how long is it on runway after starting its takeoff roll.
A spherical shell has an outside radius of 2.6cm and an inside radius of a. The shell wall has uniform thickness and is made of a material with density 4.70g/ cm3. The space inside the shell is filled with a liquid having a density of 1.23g/cm3.
A fireman d = 46.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of θi = 38.0°, at what height will the stream of water strike the building
A 78-kg person in a moving car stops during a car collision in a distance of 0.78m, Determine the speed of the person before the air bag opens up
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