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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?
When at rest, a proton experiences a net electromagnetic force that has a magnitude of 7.2 × 10-14 N and points in the positive x-direction. Find the magnitude and direction of the electric field
Early underwater exploration was conducted with a diving bell. Acylindrical diving bell 3.0 m in diameter and 4.0 m tall with thebottom open is submerged to a depth of 220 m in the ocean. How high does the sea water rise in the bellat this depth
A 3.0 kg block slides along a frictionless horizontal surface with a speed of 7.0 m/s. How far up the ramp does the block slide before coming momentarily to rest
A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.542, How much force is needed to begin moving the book
A particle p traveling with a speed of vpi = 3 m/s hits and scatters elastically from another particle N, initially at rest. Particle p is deflected through 90°, leaving with a speed of vpf = 2.7 m/s, and a mass mp = 2 kg. What is the speed of the..
A circular arc has a uniform linear charge density of 2 nC/m. The value of the Coulomb constant is 8.98755 x 109 N.m2/C2. What is the magnitude of the electric field
A 743 pF capacitor is charged to 130 V and then quickly connected across a 172 mH inductor.What is the resulting frequency of oscillation
The following two traveling waves are super posed to create at standing wave: What is the resulting amplitude of the standing wave
A current-carrying 2.0 cm long segment of wire is inside a long solenoid (radius=4.0cm, 800 turns/m, current = 50mA). what is the magnitude of the magnetic force on this segment
Transform these lengths to the observers' frame of reference. Calculate the frequency of the light in the star's frame of reference.
A horizontal block-spring system with the block on a frictionless surface has total mechanical energy E = 41.0 J, What is the kinetic energy of the system at the equilibrium point
Calculate the x component of the velocity of the particle.
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