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Why is an object moving in a circle at a constant speed said to be accelerating?

First of all, it is important to remember that an object's acceleration is the rate of change of its velocity, not its speed. Velocity is a vector quantity and so must have a direction as well as a magnit...

SG
Answered by Sam G. Physics tutor
13197 Views

A mobile phone falls to the floor. The glass screen shatters while the aluminium frame remains intact. Explain why this happens in terms of the properties of glass and aluminium.

The glass screen is a brittle material so breaks with little plastic deformation.The aluminium material however shows elastic behavior and will, when the force is removed return to the original shape. Thi...

LC
Answered by Lewis C. Physics tutor
2502 Views

Magnesium is in Group 2 of the Periodic Table. It has a number of naturally occurring isotopes, including 24Mg and 26Mg. (a) (i) Explain, in terms of the subatomic particles in the atoms, why 24Mg and 26Mg are isotopes.

Both isotopes of magnesium have 12 protons as shown by Mg's proton number in the periodic table.
By definition an isotope is an atom with the same number of protons but differs in its number of neutr...

LC
Answered by Lewis C. Chemistry tutor
8307 Views

Explain why the rate of reaction slows down above the enzyme's optimum temperature.

Chemical reactions occur faster at higher temperatures since at higher temperatures the enzyme is more likely to bump into the substrate more often and with a higher energy than at a lower temperature. Th...

YI
Answered by Yasmin I. Biology tutor
20288 Views

Why did 'Reconstruction' (1865-1877) fail?

A combination of economic and socio-political factors account for the failure of Reconstruction, which was signalled definitively following the Hayes Compromise of 1877. However, the most pervasive factor...

JT
Answered by James T. History tutor
27400 Views

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