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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 32.5 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 2.90 10-11 W/m2. What is the intensity delivered to the eardrum?
A spring with a force constant of 585 N/m is compressed a distance of 40 cm. Find the resulting increase in the spring's mass in kg
A series RC circuit with C = 32 μF and R = 6.8 Ω has a 24 V source in it. With the capacitor initially uncharged, an open switch in the circuit is closed. what is the voltage across the capacitor
How does the solar nebula theory describe the dramatic density difference between the terrestrial and Jovian planets.
Two hikers begin on opposite sides of a circular lake and walk around the lake in the same direction. How far does the faster hiker walk before catching up to the slower one
Superman attemps to drink water through a very long straw. With his great strength, Find the maximum height through which he can lift the water
Find the maximum temperature in a Carnot cycle operating in a room-temperature (25?C) environment if its Carnot efficiency is 0.2
question1astronomers detect a large asteroid that far away but still heading toward earth at 754 ms. a straight
frictionless surface and are pushed together with a compressed spring between them. The spring has a spring constant of 154 N/m and the spring is compressed a distance of 2.5 m.
A bullet is fired through a board 8.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. Find the total time the bullet is in contact with the board
At NASA's Zero Gravity Research Facility in Cleveland, Ohio, experimental payloads fall freely from rest in an evacuated vertical shaft through a distance of 132 m, How fast will the payload be traveling when it reaches the bottom of the shaft
A baseball (m = 145 g) approaches a bat horizontally at a speed of 41.5 m/s (93 mi/h) and is hit straight back at a speed of 45.8 m/s (102 mi/h). what is the average force exerted on the ball by the bat
A mass of 0.8kg is located at the end of a very light and rigid rod 50 cm in length. What is the rotational inertia of the system
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