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Question: Tachometers are a reed-type frequency-measuring instrument consisting of small cantilever beams with weights attached at the ends. When the frequency of vibration corresponds to the natural frequency of one of the reeds, it will vibrate, thereby indicating the frequency. How large a weight must be placed on the end of a reed made of spring steel 0.1016 cm thick, 0.635 cm wide, and 8.890 cm long for a natural frequency of 20 cps?
why is it advisable to make use of a proper restraining seat rather than hold a child on your lap.
The average speed of a nitrogen molecule in air is about 669 m/s, and its mass is 4.43×10-26 kg. If it takes 2.66×10-13 s for a nitrogen molecule to hit a wall and rebound by the same speed but moving in the opposite direction, what is the magnitude ..
The normal boiling point of ammonia is -33.33 C. The boiling point of ammonia under 23.74 psi is -23.33 C. Suppose the pressure on the liquid ammonia at -23.33 C is suddenly dropped from 23.74 psi to 14.71 psi (1 atmosphere).
Three resistors are connected in parallel to a 12.0 V battery. Two of the resistance values are 58\Omega and 42\Omega. what is the value of the third resistor
Assume that a cloudy parcel has T = 275 K, wl = 1.5 g/kg. The background atmosphere has T = 274 K, and a relative humidity of 0.6. Assume a total pressure p = 600 hPa. What is the buoyancy of the cloudy parcel
A certain laboratory experiment requires an aluminum wire of length of 36.0 m and a resistance of 2.30 ? at 20.0°C. What diameter wire must be used? (The resistivity of aluminum at 20.0°C is 2.82 10-8 ? · m.)
Find the kinetic energy of a 81.0-kg spacecraft launched out of the solar system with speed 146 km/s by using the classical equation K =(1/2)mu^2
An extension cord made of two wires of diameter 0.129cm (no. 16 copper wire), How much power is dissipated in the cord
You are holding a compass 3.50m from a long straight electrical supply wire that is carrying a direct current perpendicularly to the local direction of the Earth's magnetic field. What is the magnitude of the current carried by the wire
Small research nuclear reactors, like those mostly used in universities, are often submerged in concrete structures that look like swimming pools. The water serves as a moderator of the neutrons. They often have a blue glow in the swimming pool a..
the cross sectional area of the nozzle of a hose pipe is 0.002 m2. the velocity of water leaving the pipe is 1.8 ms.
while walking around your apartment in socks you shuffle your feet across the floor and realize that youve accumulated
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