Physics Answers

Let planet A and planet B be two spherical planets such that the gravitational field at the surface of A is 8.0 times stronger than the gravitational field at the surface of B. Also, the radius of planet A is double the radius of planet B. Which planet has a higher density, and by what factor?

Two students are sitting 1.50 m apart. One student has a mass of 70.0 kg, and the other has a mass

of 52.0 kg. What is the gravitational force between them

Find the magnitude of the force between 1C and 2C that are 10 cm apart

How does the ideal mechanical

advantage (IMA) of an inclined plane vary

with the angle 𝜃 of the plane; that is, what

trigonometric function of 𝜃 gives the value

of IMA?

In the milikan experiment,and oil drop carries four changes and has a mass of 1.8*10^-12g.it is held almost at rest between two horizontal charged plates 1.8cm apart. What voltage must there be between the two charged plates?

four equal charge, Q = 2 microcoulomb,are located at the corners of a square that is 0.50m on a side. What is the potential energy of the array?

An ideal gas expands isothermally ( T = 410 K) from a volume of 2.50 l and a

pressure of 7.5 atm to a pressure of 1.0 atm. What is the entropy change for this

process? [Ans = 9.3 J/K]

plot a graph of voltage against current and find the slope, the slope you find from voltage to current is the resistance which is measured in ohm's.

the standard error on slope is given as 4(V2-V1)/6(12-11)

A nuclear power plant operates at 65% of its maximum theoretical (Carnot)

efficiency between temperatures of 660 0 C and 330 0 C. If the plant produces electric

energy at a rate of 1.2 GW, how much exhaust heat is discharged per hour?

[Ans = 1.4 X 10 13 J/h]

A 3.65-mol sample of an ideal diatomic gas expands adiabatically from a

volume of 0.1210 m 3 to 0.750 m 3 . Initially the pressure was 1.00 atm. Determine:

a) the initial and final temperatures, [Ans = 404 K, 195K]

b) the change in internal energy, [Ans = −1.59 X 10 4 J]

c) the heat lost by the gas, [Ans = take a guess]

d) the work done on the gas [Ans = having guessed part c) right, you should…]

Note. 1.00 atm = 101.3 kPa. Assume no molecular vibration but still use

diatomic adjustment values.