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A 20-kg loudspeaker is suspended 2.0 m below the ceiling by two ropes that are each 30° from vertical, what is the magnitude?
A block of mass 3 kilogram is pushed against a wall by a force perpendicular to the wall. Find the coefficient of static friction between block and wall
In a certain cyclotron a proton moves in a circle of radius0.800 m. The magnitude of the magneticfield is 1.10 T. What is the kinetic energy of the proton
A uniform electric field exists in the region among two oppositely charged plane parallel plates. An electron is released from strikes the surface of the opposite plate and rest at the surface of the negatively charged plate, 3.70cm distant from the ..
a 6.10times10-2kg cube of ice at an initial temperature of -18.0 c is placed in 0.880kg of water at 41.0 c in an
a 480 kg car moving at 14.4 ms hits from behind another car moving at 13.3 ms in the same direction. if the second car
Two points are given in polar coordinates by (r,?) = (3.0 m , 40.0°) and (r,?) = (5.0 m, -40.0°), respectively. What is the distance between them
The average output power of a cellular phone, which can be treated as a point of E-M waves, is 1.0W when it is "ON". Estimate the intensity of the phone's E-M waves in your brain
The sun transfers energy to the earth by radiation at a rate of approximately 1.00 kW per square meter of surface. If the solar collectors were arranged in a square array, what would be the length of its sides in kilometers and in miles
A capacitor is connected across an ac generator whose frequency is751 Hz and whose peak output voltage is 140 V. The rms current in the circuit is 3.0 A. What is the capacitance of the capacitor?
Two simple pendulums have length of 81-cm and 64-cm they are released from the same angular position at the same instant. After how much time would they both arrive at their initial position simultaneously.
The light shining on a diffraction grating has a wavelength of 495 nm (in vacuum). Determine how many lines per centimeter does the grating have
A 0.150-kg glider is moving to the right on a frictionless,horizontal air track with a speed of 0.80 m/s. Find the final velocity (magnitudeand direction) of each glider if the collision is elastic
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