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1. A team of tornado-chasing meteorology graduate students is out in search of tornados. They drive directly toward a tornado warning siren at 27.0 m/s. The siren emits sound at 685 Hz. What frequency of sound do the students hear?
2. As you run toward a stationary trumpet player at 5.60 m/s, you hear a tone at a frequency of 580 Hz. Find the frequency you would hear if you stood still. Take 340 m/s for the speed of sound in air.
you have three 3.0 uf capacitors. two of the capacitors are in parallel and this parallel combination is in series with
The rope of a swing is 3.2 meter long. Find the angle from the vertical at which a 77 kilogram man must begin to swing in order to have the same kinetic energy at the bottom as a1460 kilogram car moving at 1.55 m/s
Find the smallest possible mass flow rate of the air so the air exit temperature is 20oC larger than the incoming water temperature (so it can heat it).
A 15 kg brick rests on a roof that is at an angle of 40º to the horizontal. What is the component of the force into the surface of the roof
Two friends hold on to a rope, one at each end, on a smooth, frictionless ice surface. What is the magnitude of the angular momentum of the system comprised of the two friends
A 54kg sprinter, starting from rest, runs 60m in 7.0s at constant acceleration. What is the magnitude of the horizontal force acting on the sprinter? What is the sprinter's average power output during the final 2.5s
an object weighs 15N in air and 13N when completely submergedin water. What is the volume of water displaced by the submerged object
Light requires 4.5 years to travel from the nearest star to earth. If we could travel there in a spaceship going 90% of the speed of light, the trip would require 5.0 years according to clocks on earth. How much time would pass for the passengers ..
You happen to remember someone telling you that for small enough angles, the function sin(x) is well approximated by the value of x. You realize that a frictionless swing acts a lot like a spring---the net force behaves like a restoring force. You..
if air is 21 percent oxygen by volume and oxygen has a density of 1.31 gl what is the volume of a room that contains
A 48 kg cart is moving across a frictionless floor at 1.5 m/s. A 68 kg boy, riding in the cart, jumps off the cart so that he hits the floor with zero velocity. What is the velocity of the cart after the boy jumped
a person rides up a liftto a mountain top,but the person`s ears fail to "pop"-that is,thepressure of the inner ear does not equalize with the outside atmosphere. what is the magnitude of the net force on each eardrum
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