Physics Answers

If you are in motion with an acceleration of 2 m/s², this means that

a. your speed increases 2 m/s every second

b. your displacement increases by 2 m every second

c. your distance increases by 2 m every second

d. your acceleration increases 2 m/s every second

The intrinsic temperature of a semiconductor is the temperatures at which the intrinsic

carrier concentration equals the impurity concentration. Find the intrinsic temperature for a

silicon sample doped with 1015 phosphorus atoms/cm3

.

Two point charges are located on the positive x-axis of a co-ordinate system. Charge is 2.0cm from the origin, another charge is 4.0cm from the origin. What is the total force exerted by these two charges on a charge located at the origin?

Calculate the location of Ei in silicon at liquid nitrogen temperature (77 K), at room

temperature (300 K), and at 100 °C (let mp =1.0 m0 and mn= 0.19 m0). Is it reasonable to assume

that Ei is in the center of the forbidden gap?

Derive an expression for density of state for particle 3-D crystal having mass m with

energy ranging between E and E + dE

The depth of the fluid is 10 m. What is the specific gravity if the pressure of the fluid at 10 m is 100 kPa?

What force must be exerted on the master cylinder of a hydraulic lift to support the weight of a 2500-kg car (a large car) resting on the slave cylinder? The master cylinder has a 4.00-cm diameter and the slave has a 25.0-cm diameter.

Find the rotational inertia of 21.5 kilograms thin-walled cylindrical threshing drum of a modified palay thresher having a radius of 9 inches.

Find the rotational inertia of 21.5 kilograms thin-walled cylindrical threshing drum of a modified palay thresher having a radius of 9 inches.

What current must flow if 0.24 coulombs is to be transferred in 15ms? *