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We can reasonably model a 90-W incandescent light bulb as a sphere 7.0 centimeter in diameter. Typically, only about 5 percent of the energy goes to visible light; the rest goes largely to no visible infrared radiation.
A) Find the visible light intensity at surface of bulb?
B) Find the amplitude of the electric field at this surface, for a sinusoidal wave with this intensity?
C) Find the amplitude of the magnetic field at this surface, for a sinusoidal wave with this intensity?
You are driving to grocery store at 21. You are 100 from an intersection when the traffic light turns red. Presume that your reaction time is 0.75 and that your car brakes with constant acceleration. How far from the intersection are you when you ..
an apparatus that liquefies helium is in a room maintained at 306 k. if the helium in the apparatus is at 4.0 k what is
Tarzan swings on a 28.0-m-long vine initially inclined at an angle of 37.0° with the vertical. What is his speed at the bottom of the swing if he starts from rest
A 0.449 kg ice puck, moving east with a speed of 2.91 m/s, has the head-on collision with a 0.846 kg puck initially at rest. Assume a perfectly elastic collision, what will be the speed and direction of each object after the collision.
0.15 kg of ice is added to the tap water from the problem above. How much ice is melted in cooling the water? How much ice is left afterwards
People who do chin-ups raise their chin just over a bar (the chinning bar), supporting themselves only by their arms. Find the force his arms must exert on him during the accelerating part of the chin-up
the top of a pool table is 0.770 m from the floor. the placement of the tape is such that 0 m aligns to the edge of the table. calculate his break shot speed
a 1.5 kg block is held against a spring of force constant 18516 N/m compressing it a distance of 180 cm. How fast is the block moving after it is release
An aluminum wire having a cross-sectional area equal to 5.10 10-6 m2 carries a current of 3.50 A. Find the drift speed of the electrons in the wire
A bat can detect small objects, such as an insect, whose sizeis approximately equal to one wavelength of the sound the batmakes. If bats emit a chirp at a frequency of 53.0 kHz, and if the speed of sound in air is 340 m/s,what is the smallest insect ..
Two 63 g ice cubes aredropped into 260 g of water in athermally insulated container. If the water is initially at25°C, and the ice comes directly from a freezer at -15°C,what is the final temperature at thermal equilibtrium? (Neglect the heat capa..
a point source of light is submerged 2.2m below the surface of a lake and emits rays in all directions. what is the maximum radius that this circle could have
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