An iron rod has a length of 50m when the temperature is 20 C, By how much will it expand when the temperature rises to 30 C. Takeα=1.2 × 10-5k-1.

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?