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(a) Estimate (roughly) the total power radiated by your body, neglecting any energy that is returned by your clothes and environment. (Whatever the color of your skin, its emissivity at infrared wavelengths is quite close to 1; almost any nonmetal is a near-perfect blackbody at these wavelengths.)
(b) Compare the total energy radiated by your body in one day (expressed in kilocalories) to the energy in the food you eat. Why is there such a large discrepancy?
(c) The sun has a mass of 2 x 1030 kg and radiates energy at a rate of 3.9 x 1026 watts. Which puts out more power per units mass-the sun or your body?
What is I4, the magnitude of the current through the resistor R4 after the switch has been closed for a very long time? What is IL, the magnitude of the current through the inductor after the switch has been closed for a very long time?
The figure 23-32 shows a closed Gaussian surface in the shape of a cube of edge length 1.56 m. It lies in a region where the electric field is given by E = (3.63x + 2.67)i+ 6.69j + 6.82kN/C, with x in meters. What is the net charge (in Coulombs) cont..
The filament of a light bulb has a temperature of 2.90 103 °C and radiates 66 watts of power. Find the surface area of the filament
A 2000kg car accelerates from 20 to 60km/h on an uphill road. Determine the work done by the engine
The Graph above shows the speed of a car traveling in a straight line as a function of time. Calculate the distance traveled by the car from a time of 1.60 to 4.50 seconds
A cubical box 22cm on a side is constructed from 1.0cm -thick concrete panels. A 100 W light bulb is sealed inside the box. What is the air temperature inside the box
A solid disk 0.15 meters in radius is pulled downward by a 0.10 kg mass tied to a string wrapped around the rim of the disk. The acceleration of the disk is 0.726 m/s2. Find the torque on the disk.
A speaker fixed to a moving platform moves toward a wall, emitting a steady sound with a frequency of 225 Hz. How fast should the platform move for the person to detect a beat frequency of 1.00 Hz
A block is attached to a ceiling by a spring fo force constant k. When pulled down and released the block undergoes simple harmonic motion. The amplitude is 2, and the frequency is 1/(16pi). If the mass of the block is 3.14 kg, what is the spring ..
Figure below shows two circular regions R1 and R2 with radii r1 = 21.9 cm and r2 = 31.0 cm. In R1 there is a uniform magnetic field of magnitude B1 = 52.7 mT directed into the page, and in R2 there is a uniform magnetic field of magnitude B2 = 76.2 m..
A rock is thrown vertically upward with a speed of 19.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall. What is the speed of the rock just before it strikes the ground?
A parallel plate capacitor has a capacitance of Co = 5.40 pF when there is air between the plates. Find the maximum magnitude of charge that can be placed on every plate if the electric field in the region between the plates is not to exceed 3.00×1..
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