Live practice

Use E=hν for the first photon and E=hc/λ for the second.

Consider exactly 1.000 L of solution. Use its density to find the solution mass, take 69% of that mass as HNO₃, and divide its moles by 1.000 L.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

Frequency does not change at reflection or transmission. Use λ=\(\frac{v}{f}\) in each medium.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

SHM requires acceleration proportional to displacement and oppositely directed: a=−ω²x.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

Use the molecular form PV=NkT.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

This is free expansion into vacuum. No heat enters and no boundary work is done. For an ideal gas internal energy depends only on temperature.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

At 45°C each tape division expands. Multiply the reading by the tape's expansion factor. Since rod and tape are the same material, cooling both restores the numerical length.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

Equate hydrostatic pressure to atmospheric pressure.

Principle and reasoning. Work from the governing physical relation and apply it to every stated part.

Shear modulus equals shear stress divided by shear strain.

For a circular orbit, U=−2K and E=K+U=−K. The orbiting body already possesses kinetic energy.