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Assume the Earth contains roughly the same amount of the neutrons and protons. Estimate
1. The number of protons in Earth
2. The charge Earth would have if all its electrons were removed
a blobsled starts from rest and slides down a frictionless 7.5 deree slope. whats its final speed after 25
A puck (mass = 0.3 kg) slides without friction on a horizontal plane. It is attached by a light string (length = 1 m) to a ring on a peg. find the tension in the string as the puck revolves around the peg
question how does the falling mass play a role? will twice the mass require twice the stopping force if it is brought
A photon with a wavelength 4.40 scatters from an electron initially at rest. Find out the wavelength of the scattered photon when the scattered electron has its utmost kinetic energy. Kmax = 2.37*20^-14.
An astronomical telescope is designed with an overall magnification of 80x. The objective has a focal length of 98.0 cm. What should be the focal length of the eyepiece
A vacuum cleaner is plugged into a 120-V socket and uses 3.0Aof current in normal operation when the back emf generated by the electric motor is 72V. Find the coil resistance of the motor.
a potential difference of 120 v produces a current of 8.0 a in the heating element of a toaster. what is the resistance
a block with mass m 3 kg is sitting on the ground and not moving. the acceleration due to gravity is g 9.81 ms2.
For an electromagnetic wave with maximum electric field of 1400V/m , and wavelength of 490nm. What is the intensity of the wave described
A dart is thrown horizontally toward the bull's-eye, point P on the (non-standard size) dart board in the figure, with an initial speed of 8.9 m/s. It hits at point Q on the rim, vertically below P 0.14 s later. What is the distance PQ? How far aw..
There are many estimates of the number of stars in the universe. One estimate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe.
A 139 x 139 timber is used as a short foundation post. It must support a load of 42 kN. Determine the average axial stress in the post
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