Physics Answers

An election is accelerated from rest through a potential difference of 15V. What is the change in electric potential energy of the electron?

The expression for the number of molecules in a Maxwellian gas having speeds in the range vto v+ dv is

dNv= 4πN(m÷2πkbT)^3/2 v^2exp[-(mv^2÷2kbT)]dv using this relation, obtain an expression for most probable speed

Discuss the sedimentation in brownian motion and show that during sedimentation, particle concentration decreases exponentially as height increases

Calculate the temperature at which root mean square speed of gas molecules is double of its speed at 27°c pressure remaining constant

Calculate the work done by a force F vector = (x-y) i^ +xy j^

in moving a particle

counterclockwise along the circle x² +y² =4 from the point (2,0) to the point

(0, -2).

Determine the value of the constant a for which the vector field

F vector =(2x²y+ z²) i^ +(xy² -x²z) j^ +(axyz -2x²y²) k^

is solenoidal.

An object is dropped from a helicopter which is moving horizontally at a constant velocity of 45m/s^1 180m above the ground. What is the time taken for the object to reach the ground?

For very large resistances it is easy to construct R-C circuits that have time constants of several seconds or minutes. How might this fact be used to measure very large resistances, those that are too large to measure by more conventional means?

The direction of current in a battery can be reversed by connecting it to a second battery of greater emf with the positive terminals of the two batteries together. When the direction of current is reversed in a battery, does its emf also reverse? Why or why not?

Hannah with a mass of 56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m high roller coaster Loop in a THEME park.

Find the following:

A.Hannah’s kinetic energy at the top of the loop.

B.Hannah’s potential energy at the top of the loop.

C.Assuming negligible losses of energy due to friction and air resistance, determine Hannah’s total

mechanical energy at the bottom of the loop (h=0 m).

D.Determine Hannah’s speed at the bottom of the loop.