12. A boy of mass 50 kg running 5m/s jumps on to a 20kg trolley

travelling in the same direction at 1.5m/s. Find their common

velocity. Assume that there is no external unbalanced force

working in the horizontal direction.

Two elements are found in the same column of the periodic table. You would expect these elements to have the same number of electrons very different properties similar properties the same atomic mass

Wave speed depends on frequency and what else? hints wave speed depends on frequency and what else? amplitude wavelength period none of these

What scientific question does Isaac Asimov most clearly address with his story "Runaround"? A. Should robots be allowed to marry? B, should robots be treated as members of the family? C. Can robots be trained to follow a moral code? D.

What conditions are necessary for our bodies to maintain homeostasis and function properly?

What physical property of light changes and causes the light to refract, or bend?

One problem when using rigid metal conduit in a residence is that the installation of the conduit may a weaken the structure b require an equipment ground c be a fire hazard d be an electrical hazard

What is the momentum of a 1.10 ✕ 104 kg garbage truck moving at 25.0 m/s?

Why doesn't a transformer work with direct current? why is ac required?

Which term describes the region in which an electron is most likely to be found? path cloud isotope orbital

The distance between two consecutive nodes of a standing wave is 21.9 cm. the hand generating the pulses moves up and down through a complete cycle 2.13 times every 3.65 s. find the velocity of the wave. answer in units of m/s.