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You are hired to design an infra red camera that will detect intruders in the dark. Suppose that the human body is blackbody at 37oC (310 K):
A. Find what wavelength should your camera be able to detect?
B. Find how much power per square meter does the human body radiate?
C. Find how many photons per second are emitted per square meter (suppose that all photons are emitted at the wavelength found in part A)?
An outside loudspeaker (considered a small source) emits sound waves with a power output of 125 W. (a) Find the intensity 12.5 m from the source. ______W/m2 (b) Find the intensity level in decibels at that distance.
A spaceship leaves Earth traveling at 0.65 c. A second spaceship leaves the first at a speed of 0.80 c with respect to the first. Calculate the speed of the second ship with respect to Earth if it is fired directly backward toward Earth
A solenoid 22.0 cm longand with a cross-sectional area of 0.500cm2 contains 415turns of wire and carries a current of 85.0 A. Calculate the magnetic field in the solenoid. Calculate the energy density in the magnetic field if thesolenoid is filled wi..
A wooden raft has a mass of 81 kg. while empty it floats in water (density 1000 kg/m3) with 64% of its volume submerged. What mass of sand can be put on the raft without it sinking.
The planet Uranus has a radius of 25560km and a surface acceleration due to gravity of 11.1m/s^2 at its poles. Calculate the mass of Uranus from the above data
An electric motor can accelerate a Ferris wheel of moment of Inertia I=20,000kg m2 from rest to 10rev/min in 12second. Find what power is required to maintain this rotational speed
A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is needed to begin moving the book
A horizontal mass-spring system undergoes simple harmonicoscillation ( no friction). the mass on teh spring is 12 kg and hasmax speed of 2.75m/s. determine the period of the oscillation of the system
Two events in regerence frame S occur 10 microseconds apart at the same point in space. What is the distance between the events in frame S'
What is the minimum area (in square meters) of the top surface an ice slab 0.251 m thick floating on fresh water that will hold up a 1060 kg automobile
How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit and screen is doubled
An astronaut constructs a pendulum with a length of 1 meter on a new planet. If the period is 3 second, what is the acceleration due to gravity
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