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The angle subtended by the moon's diameter at a point on the earth is about 0.524° (Figure). Use this and the fact that the moon is about 384 Mm away to find the diameter of the moon. (The angle subtended by the moon ? is approximately D/rm, where D is the diameter of the moon and rm is the distance to the moon.)
a string with both ends held fixed is vibrating in its third harmonic. the waves have a speed of 195 and a frequency of
A thin rod has a length of .25 m and rotates in a circle on a frictionless tabletop. The axis is perpendicular to the length of the rod at one of its ends. What is the angular momentum of the rod before the bug started crawling
Unpolarized light passes through 5 parallel ideal polarizing filters. What is the ratio of the initial intensity to the final intensity of the light
How fast must an electron move to have a kinetic energy equal to the energy of a photon of wavelength (l = 600 nm)?(The energy of the electron is assumed to benon-relativistic)
A capacitor with air between its plates is charged to 130 V and then disconnected from the battery. Whena piece of glass is placed between the plates, the voltage acrossthe capacitor drops to 25 V. What is the dielectric constant of the glass?
A hoop and a disk, both of 0.70- m radius and 5.0- kg mass, are released from the top of an inclined plane 3.0 m high and 8.2 m long. What is the speed of the hoop
A student proposes to measure the gravitational constant G bysuspending two spherical objects from the ceiling of a tallcathedral and measuring the deflection of the cables from the vertical. what is the separation of the objects
An ideal fluid, of density 0.90 x 10^3 kg/m^3, flows at 6.0 m/s through a level pipe with radius of 0.50 cm. Find the speed of flow in the second pipe
A 1.5 m long stick by a mass of 0.3 kg is pivoted on a hinge at one end and held horizontally by a spring with spring constant 10N/m attached at the other end. What is the frequency, f (in Hz), of small up and down oscillations of the stick?
An airplane is flying through a thundercloud at a height of 1600 m. what is the electric field vector E at the aircraft
Find the power factor for an RC circuit connected to a 70.0Hz generator with an rms voltage of 155 V
A 111-turn circular coil of radius 2.17 centimeter is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. Obtain the magnitude of the average EMF in millivolts
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