Physics Answers

The force F experienced by the charge Q=2c moving with the velocity V with a magnitude B is given by F=qv×B

Given

V= 2i+4j+6k

F=4i-20j+12k

What then is B

If Bx=By

From the known atomic masses (nndc website), compute the Q-value of the decay

230Th →226Ra + α

Calculate the kinetic energy and velocity of the daughter nucleus after the decay.

if the mass of water filling bottle is 25g and the mass of oil filling the bottle is 20g. What is the density of the oil.

(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each.

(b) Which frequency would produce smaller hot spots in foods due to interference effects?

The maximum magnetic field strength of an electromagnetic field is 5×10⁻⁶T. Calculate the maximum electric field strength if the wave is traveling in a medium in which the speed of the wave is 0.75c

Show that, when SI units for μ0 and ϵ0 are entered, the units given by the right-hand side of the equation in the problem above are m/s.

Show that, when SI units for μ0 and ϵ0 are entered, the units given by the right-hand side of the equation in the problem above are m/s.

A stone thrown from the top of a building is given an initial velocity of 20.0 m/s straight upward. The stone is launched 50.0 m above the ground Determine the time at which the stone reaches its maximum height.

Problem 3:   Consider the definition of the work done by a force.

In which of the following situations is the term “work” being used in the context of the physics definition of work?

 Finally, after a lengthy repair, Devon’s car works.   A car skids to a stop, and the frictional force does work.   Jose works furiously to finish his term paper on time.   Marie works out at the gym.   Work was progressing smoothly at the construction site.   In order to lift a box, John has to perform positive work on the box.   As a rock falls to the ground, the gravitational force does work on the rock. 

evaluate the moment of inertia of a thin rod with axis of rotation at the centre, if its length is 100cm and its mass is 2.3kg