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Weak magnetic fields can be measured at the surface of the brain. Although the currents causing these fields are quite complicated, we can estimate their size by modeling them as a current loop around the equator of a 18--diameter (the width of a typical head) sphere. What current is needed to produce a 3.0 field - the strength measured for one subject - at the pole of this sphere?
An object is placed 18.0 cm in front of a converging lens with a focal length of 6.00 cm. determine the image location and its characteristics
The springs of a 1800kg car compress 5.4mmwhen its 64kg driver gets into the driver's seat.If the car goes over a bump, what will be the frequency of oscillations
A clock has a second hand whose tip rubs against the inside of the glass cover. what is the minimum torque that must be applied to the second hand
A wave whose wavelength is 0.064 m is traveling down a 732 m long wire whose total mass is 25.7 kg. The wire is under a tension of 2965 N. Determine the velocity of the wave on the wire
A cart 4.9 m in length moving with a velocity of 4.9 m/sec is approaching a platform which is 9.8 m above the plane of the cart's motion. how many meters before the front of the cart arrives
A football is kicked at ground level with a speed of 15.0 m/s at an angle of 37.0° to the horizontal. How much later does it hit the ground
a solid, uniform sphere (r=20 cm, density= 850 kg/m cubed) is attached by a massless cable to the ceiling of a room, find the apparent weight (the reading on the scale) when the cable tension is
A Young's double-slit interference experiment gives bright fringes separated by 2.5 cm on a screen when the experiment is performed in air. What is the new spacing between bright fringes
what is the coefficient of thermal expansion for a substance that was originally 2 m long at 20 degrees C and expants to 2.0002 m at 40 degrees C
A boat takes 3.30 hours to travel 40.0 km down a river, then 5.00 hours to return. How fast is the river flowing
Consider a heavy particle of mass m is place at the top (on the outside side, not inside) of a vertical hoop of radius R and mass M. find the location of the hoop center X as a function of angle theta of the falling particle
A 0.50-kg object is attached to an ideal massless spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.7 m/s at the equilibrium position.
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