Math Is Fun Forum

The moon is moving away from us at about 3.8cm per year.

Now I am sure that my shoddy calculations are inaccurate, but that means that the 'outwards' kinetic energy of the moon is

The energy released by by one B41 (Mk-41) nuclear bomb (the most powerful ever built), is 25 megatons.

Now, even if we allow for a ridiculous amount of heat loss, the energy released by this nuclear bomb is still many orders of magnitude greater than the 'outwards' kinetic energy of the moon.

So if only one of these bombs were exploded on the far side of the moon, it could reverse the moon's outwards movement and make it start moving towards the earth.

In fact, assuming 99% conversion to thermal energy, the speed of moon will be 5.33 km per year inwards. Not very fast - but it is on a collision course with earth. However, the bomb could also disturb the orbit of the moon, which will affect the climate on earth. In addition, the governments of the world will undoubtedly have built more and more powerful weapons, so a 'war for the moon' could be apocalyptic.

Sometimes when I wake up in the middle of the night with all the curtains drawn, I have fun imagining that my room has been tossed into space, and that if I open any doors I will be flung out into deep space. Variants on this include the world outside suffering from nuclear fallout, bricks filling the doorway, like in the matrix, or space being curved, so that exiting through one door will mean entering through the other. When I am imagining this and the night is dead silent, it almost feels real. It feels pretty cool but also a bit scary.
What if one night I wake to find out that my imaginings have become reality? To think that your mind can mold reality is a pretty scary thought.

When the object hits the ground again h = 0.

To find the value of t at that time, solve:

But when t = 0 represents the time it is launched, so the value of t when it lands is 8.

Hi
I would just like everyone to know I am not bobbym

Thanks, I think that's good advice

Thanks so much soroban and avon! I shouldn't do maths too late at night

Gah! Of course! I made an arithmetic error which made it unsolvable. thanks bobbym

I think a possible solution to this is smaller classrooms. Last year my physics classroom had 13 people, and it made a remarkable difference. Our teacher was able to chat with us and become friends, and that really made the classroom atmosphere more enjoyable. Right now, with big classrooms, teachers can only really act as mechanical robots, reading out the curriculum. They have too many people to deal with and don't have time to make learning fun.

The definitions are:

They are partially related to the usual trig functions in that they interact similarly

etc

Usually you won't encounter them until university calculus