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In this section suppose the temperature is 20oC unless directed otherwise. At 28 meter from a sound source, the intensity level is 68 dB. Find what is the level at distance of 76 meter? Determine what the level at distance of 302 meter?
An electric motor rotating a workshop grinding wheel at a rate of 1.01 102 rev/min is switched off. How long does it take for the grinding wheel to stop
Suppose a child drives a bumper car head on into the side rail, which exerts a force of 4000 N on the car for 0.200 s. What impulse is imparted by this force
A 1.11 kg mass is at the center of a uniform spherical shell of mass 1.09 1020 kg and radius 1.07 106 m. Find the resultant gravitational force on the mass
A car of mass 1200kg is heading east at 10m/s. A second car of mass 1500kg is heading west at 20.0m/s. They meet in an elastic collision. What was the initial kinetic energy of the system
Ed cycled 75.57 km inone hour. Suppose the entire distance was made by traveling oncearound a large circular track. what is the average force that maintains his circular motion
The Mini Cooper is rated at the maximum power of 115. hp (1 hp=746 W), when moving at 80km/h. Suppose that the net force accelerating the car is constant.
You sing into a well and find that the well resonates at frequencies of 187 Hz and 221 Hz with no resonances between these two frequencies. What is the depth of the well
a long string carries a wave a 5.20-m segment of the string contains four complete wavelengths and has a mass of 180 g.
An elevator has a mass of 1170kg and carries a maximum load of 786 kg. A constant frictionalforce of 4260 N retards its motion upward. The accelerationof gravity is 9.8 m/s2. What power must the motor deliver at a instantaneous speed of 3.36 m/s i..
If she is served 200 of coffee at 84 in a well-insulated container, how much ice at 0 should she add to obtain a final temperature of 31.
carpet is to be laid in a room that is in the form of acircular sector with a central angle of 105o. if thelength
The tension at which a fishing line snaps is commonly called the line's "strength." Find what minimum strength is needed for a line that is to stop a salmon of weight 85 Newton in 8.9 centimeter
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