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A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 380. When a jetaircraft is taking off, the sound intensity level experienced by the crew member is 84 dB. What would the sound intensity level beif the crew member removed the protective earplugs?
q1. clarify how einsteins contribution to understanding the force between the earth and the moon differed from newtons.
Engineers have developed a bathyscaph that can reach ocean depths of 5.3 mi. what is the absolute pressure at that depth
A solid circular disk has a mass of 1.2 kg and a radius of 0.18 m. Each of three identical thin rods has a mass of 0.15 kg. Find the moment of inertia of the stool with respect to an axis that is perpendicular to the plane of the disk at its center
A singly charged ion (charge q = +1.60e-19 C) completes four revolutions in a uniform magnetic field, Calculate the mass of the ion in kilograms
Two railroad freight cars with masses 130 (Mg) and 170 (Mg) approach with equal speeds of 0.330 (m/s). What fraction of the original kinetic energy was lost in this inelastic collision
A compound microscope has a barrel whose length is 15.0 cm and an eyepiece whose focal length is 1.5 cm. What focal length must the objective have
A copper beaker of mass 0.20 kg contains 0.10 kg of water at 20.0degree C. A block of silver of mass 100 g at 90.0 degree C is added to the beaker of water. The entire system is thermally insulated from the surroundings, (specific heats- copper: 3..
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. How much time is required for the projectile to come up to speed
A golf club striking a golf ball imparts a force of2100N over a time of 5.06×10?3s at an angle of 35.0? above the horizontal. What maximum height does the golf ball achieve after impact
An incident ray strikes a mirror with an angle of 30 degrees to the surface of the mirror. What is the angle of the reflected ray
A rod of length L and mass M is balanced in a vertical position at rest. The rod tips over and rotates to the ground with its bottom attachment to the ground never slipping. find the velocity of the tip just before it hits
A charge of +q is located at the origin, while an identical charge is located on the x axis at x = 0.54 m. Where should the third charge be located
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