The work function of a metal is 1.98 ev. what is the threshold frequency of the metal in hz?

A bookshelf is 2m long, with supports at its end (p and q). A book weighing 10N is placed in the middle of the shelf. what are the upward forces acting on p and q. if the book is moved 50 cm from q, what are the forces at p and q now?

A rocket is fired at 100 m/s at an angle of 37, what was its speed at the top of its path?

Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health.

A 34 kg block slides with an initial speed of 9 m/s up a rampinclined at an angle of 10o with the horizontal. Thecoefficient of kinetic friction between the block and the ramp is0.6.

In a vacuum light, waves and radio waves have the same A) frequency B) period C) speed D) wavelength

A man consumes 2245 kcal of food in one day, converting most of it to maintain body temperature. If he loses half this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate?

If an eagle and a bumblebee are traveling at 8km/hr which has more momentum?

For each case, identify the force (including its direction) that causes the acceleration. (a) A sprinter at the very start of the race.

Select the effects of radiation below that are stochastic: associated with short-term, high-level exposure associated with long-term, low-level exposure include cancer and other DNA mutation include burns and radiation sickness

On the modern periodic table, elements are ordered according to what?