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A 50. cm diameter wheel is rotating inititally at 2.0 Revolutions per second. It slows down uniformly and comes to rest in 15 seconds. a. what was its angular acceleration?
A 9.0 µF capacitor is charged by a 14.0 V battery through a resistance R. The capacitor reaches a potential difference of 4.00 V at a time 3.00 s after charging begins. Find R.
A hiker walks 53.1 degrees north of east for 2.5km then due east for 2.0km. What is her total displacement from her starting point if you measure the distance along a straight line?
You are in a boat that can move in still water at 7.0 m/s. You point your boat directly East across a river to get to the other side that is 200 m away. The river is flowing at 4.0 m/s. (a) Determi
On a snowy day with the temperature near the freezing point, the coefficient of static friction between a car's tires and an icy road is 0.08. What is the maximum incline that this four-wheel-drive
A helicopter moves in such a way that its position at any time is described by the horizontal and vertical equations x = 5t + 12t2 and y = 10 + 2t + 6t2 , where x and y are in meters and t is in se
If the heat loss from the portable classroom is 15 kW, how many heating units are required to maintain the classroom at a temperature of 20 degrees celcius?
A well with vertical sides and water at the bottom resonates at 10 Hz and at no lower frequency. The air in the well has a density 1.04 kg/m3 and a bulk modulus of 1.01 x 105 Pa. How far down (in m)
Limit your drawing to the region between the plates, avoiding their edges, and draw the lines for surfaces that are 10.0 V apart, starting at the low-potential plate.
A parallel-plate air capacitor has a capacitance of 500pFand a charge of magnitude 0.250uC on each plate. The plates are 0.700mm apart. What is the surface charge density on each plate? (what does
Two wheels, A and B, are arranged by a belt system. The radius of B is three times the radius of A. What would be the ration of the rotational inertias Ia/Ib if (a) both wheels have the same angular
Assume the earth to be sphere of a uniform density, (a) what is its rotational energy? Take the radius of the earth to be 6,400 km and the mass of the earth to be 6x10^24kg.
At some instant the velocity components of an electron moving between two charged parallel plates are Vx=1.5x10^5m/s and Vy=0.30x10^m/s. If the electric field between the plates is given by E = j1.
What would happen to the speed of sound in air if the atmosphere were mostly argon rather than nitrogen? Explain.
Lightning rods are used to protect houses and barnes from lightning; the lightning current runs through the copper rather than through the building. Why. Why should the end of the rod be rounded?
If it is not uniform, how is it distributed? Is the electric field inside the sphere still zero ? In each case justify your answers.
A certain region of space bounded by an imaginary closed surface contains no charge. Is the electric field always zero everywhere on the surface? If not, under what circumstances is it zero on the s
A pilot flies her route in two straight-line segments. The displacement vector A for the first segment has a magnitude of 230 km and a direction 30.0o north of east.
What is the average force acting on Superman that gives his upward acceleration?. In determining the initial velocity, ignore the distance superman travels during his initial acceleration stage. Als
What are the three longest wavelengths for standing waves on a 300-cm-long string that is fixed at both ends?
With the power supply disconnected, the dielectric material is removed and the potential difference between the plates is measured to be 400 V. What is the dielectric constant of the material that w
The electric potential at a position located a distance of 22.8 mm from a positive point charge of 8.00×10-9C and 13.9 mm from a second point charge is 1.34 kV. Calculate the value of the second
A 117-cm-long, 3.00g string oscillates in its n = 3 mode with a frequency of 180Hz and a maximum amplitude of 5.00mm. What is the wavelength in the string? What is the Tension in the string?
Conducting sphere X is initially uncharged. Conducting sphere Y has twice the diameter of sphere X and initially has charge q. If the spheres are connected by a long thin wire, which of the followin