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At a certain location, the horizontal component of the earth's magnetic field is 4.90 x 10-5 T, due north. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight. Find what is the speed of the proton.
________ m/s
A concave mirror lies flat on the floor with F=1m. A ball isdropped from 3m. Describe the image of the ball as it fallsdown and determine at what time will the sizes be equal.
Three, 240-ohm resistors can be connected together in four different ways, making combinations of series and/or parallel circuits. what is the net resistance in each case
Consider a parallel plate capacitor with an area of 2 cm^2 and a plate separation of 0.02 mm which is charged to a voltage of 2 kV. The work function for the electrons in the plate is 3.8 eV. Compare the electron tunneling current when there is a vac..
White light containing wavelengths from 405 nm to 760 nm falls on a grating with 8000 lines/cm. How wide is the first-order spectrum on a screen 2.20m away.
The Hubble Space Telescope (HST) has excellent resolving power because there is no atmospheric distortion of the light. Its 2.4-m-diameter primary mirror can collect light from distant galaxies that formed early in the history of the universe. How fa..
A uniform rod of length L rests on a frictionless horizontalsurface. The rod is pivoted about a fixed frictionless axis at oneend. The rod is initial at rest. A bullet traveling parallel to thehorizontal surface and perpendicular to the rod with s..
A 2,493-kg car is moving down a road with a slope (grade) of 14% at a constant speed of 13 m/s. What is the direction and magnitude of the frictional force?
A container at 25°C holds 0.50 moles of helium at a pressure of 2.5 atm. What is the volume of the container
The radius of a typical human eardrum is about 4.0 mm. Find the energy per second received by an eardrum when it listens to sound that is at the threshold of hearing.
A horizontal spring with force constant k = 4.80N/m connects the other end of the rod to a vertical wall. The rod is in a uniform magnetic field B = 0.310T directed into the plane.
The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.800, and the log has an acceleration of 0.800 m/s2. Find out the tension in the rope.
you have a string with a mass of 14.1 g. you stretch the string with a force of 8.49 n giving it a length of 1.97 m.
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