Physics Answers

Find the value of the electric field at a distance r=10 cm from the center of a non-conducting sphere of radius R=1 cm which has an extra positive charge equal to 7 C uniformly distributed within the volume of the sphere.

A cardboard box is sliding across the floor after some initial push gets it moving. The box is not being pushed anymore, just sliding across the floor. The floor is exerting friction on the box. What will happen to the box and why?

You are operating a remote - controlled model car on a vacant tennis court . Your position is the origin of coordinates , and the surface of the court lies in the -plane . The car, which we represent as a point , has x- and y- coordinates that vary with time according to x = 2.0m - (0.25 m/s ^ 2) * t ^ 2; y = (1, 0 m/s) * t + (0.025 m/s ^ 2) * t ^ 2 a ) Find the car's coordinates and its distance from you at time t=2.0 s. b ) Find the car's displacement and average velocity vectors during the interval from Ostot t=2.0 s. c ) Find the components of the average acceleration in the interval from t = 0.5to; t=2.0 s. 

the bridge rectifier is preferred to an ordinary two diode full wave rectifier becuase

The core diameter of multimode step index fibre is 60 micrometer. The difference in refractive index is 0.013. The core refractive index is 1.46. Predict the number of guided modes when the operating wavelength is 0.75 micrometer

A penny is dropped from the observation deck of the Empire State building (369 m above the ground). With what velocity does it strike the ground?

determine the magnitude and direction of electric field due to the point of 4.0 to the left of a point charge of -2.5nc

neutron stars are some of the densest objects in universe. The form during supernova explosions and very small compared to other astronomical objects you can assume 5*10¹⁷kg/m³ as the average density of a neutron star The earth has a total mass of about 5.97*10²⁴kg what would be the diameter of the earth if it had the density of a neutron star

How is the strength of an electric field indicated with field lines?

How are a gravitational and an electric field similar?