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An observer that is standing 12m from a stereo sound speaker perceives the sound level from the speaker to be 60 dβ. How much further away from the speaker must the observer walk to hear a sound level of 50 dβ?
As a dilligent physics student, you carry out physics experiments at every opportunity. At this opportunity, you carry a 1.35-m-long rod as you jog at 3.05 m/s, holding the rod perpendicular to your direction of motion. What is the strength of the..
Water rises in a capillary tube to a height of 8cm. Water hasa surface tension of 73 dynes/cmand a contact angle of 20 degrees. What is the diameter of the capillary
An unknown mass of tin is heated to a temperature of 202 C. It is placed into 200 g of water which is in a 100 g copper cup initially at 10 C. How much heat is gained by the cup and the water
A glass fiber of index 1.50 is used to transmit light but is submerged in water of index 1.33. What is the critical angle for light to stay inside the optical fiber
An open-tube mercury manometer is used to measure the pressure in an oxygen tank. When the atmospheric pressure is1140mbar, what is the absolute pressure (in Pa) in the tank if the height of the mercury in the open tube is26.0cm higher than the mer..
An empty capacitor is connected to a battery and charged up.The capacitor is them disconnected from the battery, and a slab ofdielectric material is inserted between the plates of thecapacitor. What happens to the potential difference between the ..
A 4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. If during the oscillation the velocity is 12.0 cm/s when the displacement is 4.00 cm, then what is the maximum velocity of the simple harmonic motion?
A hot-air balloon is rising straight up with a speed of 1.82 m/s, How much time elapses before the ballast bag hits the ground
The electric motor in a toy train requires a voltage of 3.1V .Find the ratio of turns on the primary coil to turns on the secondary coil in a transformer that will step the 110V household voltage down to 3.1V .
The masses of the earth and moon are 5.98 × 1024 and 7.35 × 1022 kg, respectively. What is the magnitude of the charge placed on each body
A light string is wrapped around a 0.160-kg hollow 0.080-m-radius hoop. The hoop is released from rest and the fee end of the string is held in place. What is tension in the string while the hoop falls
A turntable 1.90 m in diameter rotates at 78.0 rpm . Two speakers, each giving off sound of wavelength 30.6 cm, find the greatest beat frequency the listener
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