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Que pourrait-on faire pour réduire la pollution?

D'après moi, il faut agir vite pour réduire la pollution et sauver notre planète. Toutes nos petits gestes éco-citoyens aideront lutter contre la pollution sans cesse. Par exemple, il faut éteindre les lu...

Answered by Harry P. • French tutor

2066 Views

An exoplanet, 0.01% the mass of the Sun, orbits a star 2 times the mass of the Sun at a distance of 1AU = 1.5x10^8 km. Using Newton's Law of Universal Gravitation, determine the force between the exoplanet and the star. Mass of Sun = 2x10^30kg.

This question is not particularly tricky as long as it is read carefully.
First, calculate the masses of the Star and the Exoplanet. Double the mass to find the star mass (M). To find the planet mas...

Answered by Thomas R. • Physics tutor

1830 Views

What happens to the equilibrium constant of an endothermic reaction, that is in equilibrium, when the temperature increases? What would the effect of increasing pressure have on the reaction and on the value of Kc?

Increasing the temperature of an endothermic reaction would favour the forward reaction, thereby increasing the concentration of the products compared to reactants, which in hand increases the value of Kc...

Answered by Campbell N. • Chemistry tutor

12680 Views

Show that (x + 1)(x + 3)(x + 5) can be written in the form ax^3 + bx^2 + c^x + d where a, b, c and d are positive integers.

The way to go about a question like this is to break it down into steps; rather than trying to multiply all the brackets at once expand two first then multiply by the third. ------------------------------...

Answered by Mohammed Burhan A. • Maths tutor

12238 Views

When do I use the subjunctive?

There are many times in Spanish when you are required to use the subjunctive, but for now I will explain in detail one common category of uses that tend to cause confusion for Spanish students. This can b...

Answered by Lotte B. • Spanish tutor

1756 Views