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what is the magnitude of the electrostatic force between two electrons separated by a distance of 1.00 X 10-8 meter?
A train starts from a station nd travels with uniform acceleration 0.5ms for 20 second. it travels with uniform velocity for another 30 second , the brakes are then applied so that a uniform retardation is obtained and the train comes to rest in a further 10 second. Sketch the velocity time graph of this motion. Using ur graph, Calculate the total distance travelled by the train.
The half-life of strontium-91, 91
38Sr is 9.70 h. Find
(a) its decay constant, and
(b) for an initial 1.00-g sample, the activity after 15 hours.
how does the distance at which an electron orbits the nucleus may be changed
A steel wire of length 0.8m and density 8x10³kgm-² is fixed at both ends when vibrating transversely under a tension of 50.0N. the fundamental frequency is 300Hz. Calculate the diameter of the wire in meters. How can the same wire be made produce a note for frequency 600Hz.
6. What is the trend in ionization energy as the atomic number increases?
5. Which of the following best explains the Periodic Law and its application to the Elements?
A. Elements form groups because they are formed in similar circumstances and therefore behave similarly in nature
B. The Periodic Law is consequence of law of multiple proportion discovered by John Dalton in 1803
C. Elements from the same group have similar physical and chemical properties due to the fact they similar electronic structures
D. The periodic law is a simple coincidence of the names given to the elements, i.e. Halogens, Alkali Metals, Noble gases, etc. It has no fundamental bearing on the chemical or physical properties of the elements
Compute the total binding energy and the. binding energy per nucleon for
(a) 7Li (b) 20Ne (c) 56Fe (d) 235U.
An lemming with a jet pack accelerates upward at 4.3 m/s2. If the lemming ( with the jet pack) has a mass of 55 kg. What is the upward force applied by the jet pack
