Other Physics Answers

Which material that is ferromagnetic in winter (T<16 °C) and paramagnetic in summer (T>16 °C)?

The daily maximum soil-surface temperature is 40°C and the minimum is 15°C. Assuming that the diurnal temperature wave is symmetrical, that the mean temperature is equal throughout the profile (with the surface to the mean value at 6 A.M. and 6 P.M.), and that the “damping depth” is 15 cm, calculate the surface temperature at 8 A.M. What would be the temperature amplitude at a depth of 10 cm?  

Explain the net radiation balance on a surface with diagram.  

Define the following terms using equations and explain all terms used in the equation:

(a) Reynolds number (Re)

(b) Grashof’s number (Gr)

(c) Convective heat loss or gain from a body  

There are three fundamental characteristics related to diurnal and annual soil thermal regimes. Discuss these three fundamental characteristics.

When 21.44 moles of Si react with 17.62 moles of N, how many moles of Si³N⁴ are formed?

Solve Fourier series of cosx for interval -pi/2 to pi/2

What must the surface area of a piston be,if a pressure of 300kPa is used to give a desired upward force of 2000N?

A boy pulls a nail from the wall with a string tied to a nail. The string is inclined at angle 60° to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?

a screw jack with pitch 0.5cm and the handle of the screw jack is 2cm long.Determine the force(effort)that must be applied at the end when lifting a load of 200N.Consider the efficiency of the screw to be 35%.