Physics Answers

: Please provide the appropriate right answer/ answers from the choices given below and provide an explanation for your choice, as well:

  I.           Which of the following phenomena do not affect the polarization of an electrode?

a.      Diffusion of an reactant to the electrode surface

b.      Diffusion of the product from the electrode surface

c.      Convective limitations in the cell

d.      Standard Cell Potential of the redox couple

e.      Significant Activation barrier to the charge transfer

A student eat a dinner containing 8.0×10^6J of energy and wishes to lift an object in a gym of 60kg .How mang times will he lift this object to expand this much energy if he lift this object in a distance of 2.0m

Neutron stars are some of the densest objects in the universe. They form during supernova ex-

plosions and are very small compared to other astronomical objects. You can assume 5 x 10^17

kg/m3 as the average density of a neutron star. The Earth has a total mass of about 5.97 x 10^24 kg.

What would be the diameter of the Earth if it had the density of a neutron star?

Please answer with explanation.

A straight bar 500mm long is 25 mm in diameter for the first 200mm length and 15mm diameter for the remaining length if the bar is subjected to an axial pull of 15 Kant what is the deformation of the bar

For the circuit on the right, find the following quantities:

a. The circuit current.

b. The total resistance of the circuit.

c. The value of the unknown resistance, R.

d. The voltage-drop across all resistors in the circuit.

e. The power dissipated by all resistors.

100Ω

150Ω

E=25V

Rt= 800Ω

30Ω

R

At a certain point on Earth, the horizontal component of Earth’s magnetic field is 2.5 × 10-5 T due to north. An electron moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the electron.

What is the magnitude of the field if a charge of 10 C travelling at a speed of 8 × 106 m/s in a direction perpendicular to a magnetic field experiences a magnetic force of 8.7 × 10-3 N?

An electron is placed in an electric potential of 1nV. Determine the velocity of the electron after passing through the potential assuming it was motionless in the beginning

Determine the Oxidation State of the highlighted element below.

H₂ PO₄-

Solution:

two point particles of charges Q1= 45 and the Q2=85 are found to have a potential energy of 40 what is the distance between the charges