Physics Answers

A-6nC particle is moving at 4.0 x 10⁴ m/s along the positive z-axis. It passes a region indeflected where there is uniform electric and magnetic fields. The electric field is 5.75 x 10⁵ N/C along the negative x-axis. What is the magnitude and direction of the magnetic field?

A 12.4 uF capacitor is connected through a 0.895-MΩ resistor to a constant potential difference of 60.0V.

a. Compute the charge at the following times after the connections are made: 5.0s,10.0s,20.0s,and 100.0s.

b. Compute the charging currents at the same instants.

Two point charges are brought together as shown below. Calculate the electric potential energy between the two charges if q₁=2 nC and q₂= 3 nC.

1-5. Two point charges, q1 = 8 µC and q2 = -5 µC, are separated by a distance r = 0.1 m. What is the magnitude of the electric force? Note: 1 µC = 10-6 C.

the metal plates of capacitor a has an area of 1m^2 separated by a diatance of 0.002m. if a pyrex glass is inserted in between the plates, (a) what will be the change in capacitance? (b) how much energy was stored after insertion if it has a potential difference of 12v?

A box of mass 20 kg is kept on a smooth horizontal surface. Another object of mass 16 kilogram is kept on the box. The two objects are connected by a light inextensible string and the string goes over a smooth pulley. If a force of 6 Newtons is applied on the box, find the acceleration of the box.

How may revolutions per minute must the body make about vertical axis so that the cord make an angle of 45 with the vertical

Suppose we experiment with an Atwood Machine consisting of two masses m

and 2m connected by an inextensible non-slip string running over a pulley of

radius a and mass 4m, as shown below.

) Briefly discuss why no work is done by the forces of constraint. (5)

(d) What is the total energy of the system? (2)

(e) Find the acceleration dv/dt of the blocks.

Suppose we experiment with an Atwood Machine consisting of two masses m

and 2m connected by an inextensible non-slip string running over a pulley of

radius a and mass 4m, as shown below.

(a) Determine the total kinetic energy of the system. (6)

(b) Find the gravitational potential energy of the system.

A harmonic oscillator has a mass of 0.20kg and unknown spring constant,if the period is T=20g find k