Physics Answers

A star is observed to croos the meridian (due south) at an elevation of 34° as seen from an observation sited at latitude 42° north.what is the declination of the star

What is the current in a wire loop of resistance 16 Ω through which the magnetic flux changes from zero to 84 Wb in 3 s?

X-ray with energy 12 keV is used to measure Bragg-reflection peaks. The third-order peak is measured for the X-ray beam incident at an angle of 30 degrees with

respect to the horizontal. What is the spacing between the atomic planes? What

is the angle at which the first-order reflection peak is observed?

White light with wavelength range 450 - 900 nm is incident normally on a thin film

of refractive index 1.3. Light of wavelengths 500, 600, 750 nm is reflected back.

What is the minimum thickness of the film? If we could use light from 400 - 4000

nm, what other wavelengths will be reflected back?

What do you mean by the Young’s modulus for steel is 𝒀 = 𝟐. 𝟎 × 𝟏𝟎𝟏𝟏 𝑵𝒎−𝟐 ? Explain briefly

What do you mean by eccentricity

What is the gravitational field strength at the surface of a planet if a 2, k, g,

2kg basket of shopping weighs 52, N,

52N?

What do you mean by the Young’s modulus for steel is 𝒀 = 𝟐. 𝟎 × 𝟏𝟎𝟏𝟏 𝑵𝒎−𝟐 ? Explain briefly.

A centrifugal pump operating under steady flow conditions delivers 2, 270 kgm/min of water

from an initial pressure of 82, 740 Pa to a final pressure of 275, 800 Pa. The diameter of the inlet

pipe to the pump is 15.24 cm and the diameter of the discharge pipe is 10.16 cm. Determine the

work. Is it done on or done by the system?

Gold has a face centered cubic unit cell and has the density 𝟏𝟗. 𝟑 𝒈 𝒄𝒎−𝟑. Calculate the

length along an edge. (𝐴𝑢 = 197 𝑔 𝑚𝑜𝑙−1)