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Sonar is used to determine the speed of an object. A 40-kHz signalis sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?
A bungee cord is stretched between two poles with a force of 382 N. The length of the cord is 36 meters and it has a mass of 3 kg. What is the velocity of a wave on this bungee cord
Runner A is initially 8.0 mi west of a flagpole and is running with a constant velocity of 6.0 mi/h due east. Runner B is initially 6.0 mi east of the flagpole and is running with a constant velocity of 8.0 mi/h due west. How far are the runners f..
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 mT, What is the pitch of the resulting helical path
The resolution of the eye is ultimately limited by pupil diameter. What is the smallest diameter spot an eye can produce on the retina if pupil diameter is 4.45? Assume light with a wavelength of = 600 .
An athlete at a gymnasium holds a 3.0kg steel ball in his hand. His arm is 70cm long and has a mass of 4.0kg. Calculate the magnitude of the torque about his shoulder if he holds his arm
For most standard cosmologies other than deSitter the scale factor varies as t^n, with n
The magnetic field at the center of a 0.900-cm-diameter loop is 2.70mT . A. What is the current in the loop? B. A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.70mT ?
a wire carrying a current is placed in a uniform magnetic field. When a current of 3.7A flows in the wire there is a force of 0,075N on each 18cm of wire in the field
What is wavelength in meters of an electron
When the air temperature is below 0, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.60 cm thick is at -10.30 Celsius and the bottom surface is at 0.00 Celsius, compute the time it will ta..
A lid is put on a box that is 14 cm long, 13 cm wide, and 8.0 cm tall and the box is then evacuated until its inner pressure is 7.3 104 Pa. How much force is required to lift the lid at sea level
A mass M=171 kg is suspended from the end of a uniform boom. The boom (mass=69.0 kg, length=3.60 m) is at an angle %u03B8=69.0 deg from the vertical, Calculate the tension in the horizontal cable
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