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Find the minimum aperture diameter of a camera that can resolve detail on the ground the size of a person (1.5m ) from an SR-71 Blackbird airplane flying at an altitude of 26km . (Assume light with a wavelength of 470nm .)
Older freezers developed a coating of ice inside that had to be melted periodically; an electric heater could speed this defrosting process. What is the resistance of the wire
A flat sheet of crown glass has a thickness of 1.4 cm. It is on top of a flat sheet of crystalline quartz that has a thickness of 1.3 cm. Light strikes the crown glass vertically and travels through it and then during the crystalline quartz. In the t..
Completly lost , a projectile is fired vertically upwards .air drag dissapates 68 kj during it's ascent . how much higherwould it have gone if air drag were negligible
Ambulance siren emits a frequency of 500 Hz moving at a speed of 20 m / s to walk along the highway. If the propagation of sound in air 330 Hz and wind speed of 5 m / s direction of movement of ambulances. Determine frequency heard by an observer sit..
A 250g , 49.0 cm diameter turntable rotates on frictionless bearings at 60.0 rpm. What is the turntable's rotation angular velocity when the block reaches the outer edge
A screw with 15 threads per centimeter is driven 1.01 cm into its fixture in 11.2 s with a cordless electric screwdriver. What is the average angular speed of the screwdriver
There is a uniform electric field throughout the region given by E = 4.9i + 7.1j + 3.6k in N/C units, What is the magnitude of the total flux through the five non-shaded faces
Initially there are 6*10 power 9 radioactive of element w (decay constant 0.173/day) in a sample. As a nucleus of w decays, it converts 2.67*10 power -28 kg of its mass to energy and releases the energy. How much time (in days) is needed for the samp..
A solid disk with a moment of inertia of 3.53 kg m2 is spinning about its axle such that the disk rotates by 2p radians (1 rev) every 0.300 s. The axle is tilted through an angle of p radians (180°) in a time of 0.28 s.
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. How long is each rod
What is the wavelength of the light in the glass
A round wooden log with a diameter of 85 cm floats with 18%of its radius out of the water. What is the log's density
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