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A weight is attached to one end of a lightweight spring held at other end. When the weight comes to rest, the spring is stretched 20 cm beyond its natural length. In another condition the weight is completely immersed in water. When the weight comes to rest, the spring is stretched 15 cm beyond its natural length .Question: How many times greater is the density of the weight, compared with the density of water?
At a construction site, a 23.0 bucket of concrete is connected over a very light frictionless pulley to a 310 box on the roof of a building. (See the figure.) There is no appreciable friction on the box, since it is on roller bearings. The box starts..
You have a 1.5 m long copper wire. You want to make an N-turn current loop that generates a 2.4 mT magnetic field at the center, What will be the diameter of your coil
An electromagnetic wave of wavelength 405 nm is traveling in vacuum in the -z direction. What is the magnetic-field amplitude of this wave
An elementary particle called a pi meson (or pion for short) has an average lifetime of 2.6×10?8s when at rest. Find the average distance traveled by the pion as measured by the same observer
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box, Find the acceleration of the box
A bowling ball (solid sphere mass=7.27 and radius=12.7cm) is rolling on level ground at a constant angular speed of 55rad/s. what is the total kinetic energy of the ball?
The amount of 14C in an old, isolated sample of vegetation is 0.757 that expected from a present day sample with an equivalent carbon content, Calculate the age of the old sample in years
In the equation, m1 = 11.0 kg and m2 = 3.5 kg. If the system is set in motion with m2 moving downward, what will be the acceleration of the system
An automobile has a vertical antenna 1.30 m long. The automobile travels eastward at 65 km/h on a horizontal road, Calculate the maximum magnitude of the induced emf in the antenna
Standing on the ground 2.7 m from the wall of a building, At what speed should you throw the package so it just barely reaches the window
A beam of light propagating in glass (n=1.52) is incident on an interface with an unknown material. When the incident angle is exactly 62° the all of the light is reflected at this interface, but for smaller angles some light is transmitted. What is ..
A certain lightbulb filament when hot has a resistance of205 %u03A9. What current is flowing through the bulb at that time
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