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The figure shows a lower leg being exercised. It has a 49-Nweight attached to the foot and is extended at an angle with respect to the vertical. Consider a rotational axis at the knee, as indicated. (a) When =89°, find the magnitude of the torque that the weight creates.(b) At what angle does the magnitude of the torque have a value of 15 N·m?
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 2.8 later. If the speed of sound is 340 , how high is the cliff
question1consider a radius1.0cm circular nondiverging pencil beam of 3x108 photons one-third with an energy of 1 mev
consider two point charges located on the x axis one charge q1 -14.5 nc is located at x1 -1.700 m the second charge
A student on a piano stool rotates freely with an angular speed of 3.05 rev/s. Calculate the initial kinetic energy of the system
a piano string having a mass per unit length equal to 4.00 times 10-3 kgm is under a tension of 1100 n. find the speed
A uniform cylindrical turntable of radius 1.50 m and mass 29.2 kg rotates counterclockwise in a horizontal plane with an initial angular speed of 4? rad/s. The fixed turntable bearing is frictionless. A lump of clay of mass 2.49 kg and negligible ..
Two particles with charges +5e and -5e are initially very far apart (effectively an infinite distance apart). They are then fixed at positions that are 6.78 x 10-13 m apart
A transverse wave propagates in the positive x-axis with a wavelength of .3m and a period of .001s. What is the frequency and speed of this wave
An incident x-ray photon is scatterted from a free electron that is initailly at rest. What is the magnitude of the electron after its collision
1. identify three specific challenges to making direct measurements in the fields of astronomy chemistry physics or
A typical nuclear power plant converts 0.01% of the mass of its fuel into energy through nuclear reactions. How much fuel would be needed to power an average city for one day
Volcanoes on the Earth eject rocks at speeds of up to 160 m/s. Consider a 1260 m high volcano that ejects rocks in all directions. What is the maximum height above sea level reached through rocks.
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