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A mother hears a child scream from across the room, 23 feet away. The sound pressure level is 72dB. When she holds the child on her shoulder, her ear is 3 inches from the screams. Using the decibel chart, about how long until damage to her hearing occurs if the child continues screaming?
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The handle of a grinding wheel goes around a circle with a circumference of 1.2m. how much work is performed each revolution
A 2.5 kilogram ball and a 5.0 kilogram ball have an elastic collision. Obtain what is the kinetic energy of the 2.5 kg ball after the collision
A spaceship is measured to be 186 m long while at rest relative to the observer. what length does the observer measure
A 0.14 kg ball is placed in a shallow wedge with an opening angle of 126°. For each contact point between the wedge and the ball, determine the force exerted on the ball. Assume the system is frictionless.
illustrate what is the magnitude of the acceleration of the box and hanging mass?
Solar Radiation is incident on the surface of the Earth at an average of 1000 W/m^2. This is measured on a surface which is perpendicular to the incoming light
A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -6.0 x 103 J, what is the speed of the skier
an irregular conductor carries a surface charge density of -6.75 cm2 at and in the vicinity of a point p on the
A cube with a side of 25.00 cm is immersed in a fluid. Knowing that the pressure at the top surface of the box is 109.4 kPa, find the density of the fluid
Isaac Newton, having convinced himself (erroneously as it turned out) that chromatic aberration was an inherent property of refracting telescopes, invented the reflecting telescope.
A 40.0 kg beam is attached to a wall with a hinge while its far end is supported by a cable such that the beam is horizontal. what is the vertical component of the force exerted by the hinge on the beam
A solid disk of radius R and mass 2.72 kg is spinning at angular velocity 63.9 rpm about a vertical axis. What is the mass of the second disk
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