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Suppose that 15% of the volume of the average human body is contained in the head. What would the average person's density have to be so that they could float in salt water (1025 kg/m3) with their head completely out of the water.
A wheel consists of 20 thin spokes, each with mass 0.070kg , attached to a rim of mass 4.4kg and radius 0.85m. Find its rotational inertia
The diagram of a speaker has a mass of 50.0g and responds to a signal of 2.0 khz by moving back and forth a with an amplitude of 1.8 X10^-4 m at that frequency. what is the force acting on the speaker
A uniformly charged insulating rod of length 19.0 cm is bent into the shape of a semicircle. The rod has a total charge of -7.50 µC. Find the magnitude and direction of the electric field at O, the center of the semicircle. EO = N/C.
When ultraviolet light with a wavelength of 400.0 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.10 eV. What is the maximum kinetic energy of the photoelectrons
The flywheel of a motor has a mass of 300 kg and a moment of inertia of 580 kg*m^2 The motor develops a constant torque of 2000 N*m and the flywheel starts from rest. How much work is done by the motor during the first 4.00 revolutions
When additional mass is added to the piston, the height of the piston decreases to 16.4 cm. Find out the new pressure applied by the piston.
Two boys are sliding toward each other on a frictionless, ice-covered parking lot. Jacob, mass 45 kg, is gliding to the right at 7.67 m/s, What is their velocity immediately there after
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
An RLC circuit consists of a 100 omh resistor, a 20 micro Coulomb capacitor, and a 400mH inductor connected in series with a 120V, What is the reactant of the circuit
Water flows over a waterfall 10 meters to a turbine. Water flows at a rate of 10kg/sec. How much power is delivered to the turbine
A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?
Discuss the relative merits of using the Biot-Savart law and Ampere's law to calculate the magnetic field around the wire. In this case, is it necessary to include the Maxwell correction to Ampere's law?
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