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When a shower is turned on in a closed bathroom, the splashing of the water on the bare tub can fill the room's air with negatively charged ions and produce an electric field in the air as great as 1000 N/C. Consider a bathroom with dimensions 2.9 m x 2.3 m x 2.9 m. Along the ceiling, floor, and four walls, approximate the electric field in the air as being directed perpendicular to the surface and as having a uniform magnitude of 500 N/C. Also, treat those surfaces as forming a closed Gaussian surface around the room's air. What are (a) the volume charge density ? and (b) the number of excess elementary charges e per cubic meter in the room's air?
a solid cylinder of radius 6 cm and mass 9 kg starts from rest and rolls without slipping a distance L = 6.0 m down a roof that is inclined at angle ? = 30°. What is the angular speed of the cylinder about its center as it leaves the roof
A 21 kg solid door is 220 cm tall, 94 cm wide. What is the door's moment of inertia for rotation about the vertical axis inside the door, 17 cm from one edge.
The drawing shows a uniform horizontal beam attached to avertical wall by a frictionless hinge and supported from below atan angle θ = 43o by a brace that isattached to a pin. The beam has a weight of 349 N. Three additional forces keep the beam i..
An X-ray photon with a wavelength of 0.120 nm scatters off a free electron at test rest. What is the direction of the scattered electron
A 2kg box slides along a frictionless surface with a speed of 15m/s and approaches a horizontal spring with a spring constant of 2000N/m. If one end is fixed, How far will the spring compress in stopping the box
In 1916 Milikan used measurements of the kinetic energy of photoelectrons to detemine plancks constant
A 67kg man's arm, including the hand, can be modeled as a 70cm -long uniform cylinder with a mass of 3.5kg. by how much does he raise his center of gravity
Two ants race across a table 73cm. long. One travels at 4.18cm/s and the other at 3cm/s. When the first one crosses finish line, how far behind is the second one.
A technician wraps wire around a tube of length 40 cm having a diameter of 7.7 cm. If the current in this solenoid increases at the rate of 3 A/s, what is the self-induced emf in the solenoid
An unstable particle with a mass equal to 3.34x10^-27 kg is initially at rest. Find the masses of the fragments
A circular loop of conducting wire is placed in a magnetic field of 0.45T while the free ends of the wire are attached to a 30ohm resistor. What are the magnitude and direction of the current in the resistor
A converging lens (f = 11.9 cm) is located 30.6 cm to the left of a diverging lens (f = -5.94 cm). calculate the overall magnification
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