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A source emits with intensity 10-5 watt / m2. If the threshold intensity is worth 10-12 watts / m2, set the sound intensity level
A converging lens with a focal length of 5.0cm is to the left of a second identical lens. When a feather is placed 13cm to the left of the first lens, What is the separation between the lenses
What is the resistance of a thin tube filled by saline solution that is 2 cm in length and has a cross-sectional area of 1 x 10-5 m2? Suppose the resistivity of saline solution to be 0.1 m.
A 5.00-m beam is hanged horizontally about its ends by two very light cables A and B as shown in Fig. 4. The angles these cables make by the horizontal ceiling are shown, and the tension in cable A is measured to be 875 N. Discover: (a) the tension i..
A 143 O lamp, a 29 O electric heater, and a O 53 fan are connected in parallel across a 135 V line. What power is expended in the heater
On a particular afternoon in Houston, the nitrogen (N2) molecules in the air have an rms speed of 515 m/s. What is the rms speed of the carbon dioxide (CO2) molecules
a cargo plane has to drop a relief package to people in need. the plane is flying level vertical velocity 0 at 200
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is5.00 106 m. What is the orbital speed of the second satellite
A passenger car traveling down a rough road bounces up and down at 1.2 Hz with a maximum vertical acceleration of 0.20 m/s^2, both typical values. What is the amplitude of the oscillation?
an infinitely long line of charge has a linear charge density of 3.50times10-12 cm . a proton is at distance 13.0 cm
The electric field in an xy plane produced by a positively charged particle is 13.7(6.9i + 6.0j) N/C at the point (3.3, 3.3) cm and 105i N/C at the point (5.0, 0) cm. What is the charge (in Coulombs) of the particle
A child of mass 24 kg sits 2.10m to the left of the center of a seesaw. The mass of the seesaw is 35 kg. How far to the right of the central pivot must a second child of mass 40 kg sit if the seesaw is to be perfectly balanced.
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80 percent of its normal value. Now what is the minimum x-ray wavel..
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