Recent content by prasanna

Hi! Here's one problem. A piece of iron(with cavities) weighs 6000 N in air AND 4000 N in water.The density of iron is 7.87 g/cc.What is the volume of cavities? My assumption is that the weight of water displaced is equal to the buoyant force(which is right because Archimedes said so). The...

Since the astrinaut is standing on the surface, the acceleration is zero! :biggrin: But if you meant the acceleration due to gravity,g, at the surface, there is a simple formula Loads of gravitation formula are available on the thread 'Formulas' started by truimphdog1 on 7 or 8 or 9...

Try searching for some formula on Kinetic theory of gases! Once you get hold of the formula, it is very simple. (the formula is simple too)

Check out this link on mirage! http://www.suite101.com/article.cfm/science_sky/78177

Yeah k can be determined from the given data. One more thing! When you jump from a ht. of 1.4 m, the gravitational PE lost by you is definitely stored as PE in spring. But You are not actually falling 1.4 m but you are falling 1.4 m PLUS the distance contracted bythe spring. In this...

Your question in the last post was an EQUATION and you needed to solve it. This question is just an expression, not an equation. Try to figure out now why you did not get any denominator in you previous post! As for this question, you got it right this time. :smile:

I always wondered :confused: When you are standing on an open area. the pressure exerted by atmosphere on your head is the total weight of the atmosphere column just above your head.Of course, divided by the area of your head. When you are inside a closed room! Even then the atmospheric...

Check your simplification!

Your restrictions are correct

I agree with Ba. It is actually friction of the floor you are standing on that prevents you from moving. Check this out! astronauts doing space walks have mini jets on the spacesuits.Why? Because, even if they apply a little force on the spacecraft during spacewalk, they would start...

A zero vector is a point which can have any direction!. I remember reading something like this

Since you've found out the acceleration, find the force it can give.(you know mass of aircraft.)This force can be used in throwing the truck!

Replace v by \omega a by \alpha and x by \theta in your kinematics equations to get the rotational equations! \omega = \omega_0 + \alpha t \theta = \theta_0 + \omega_0 t + \frac{1}{2}\alpha t^2 \omega^2 = \omega_0^2 + 2\alpha\theta And the Equations posted by Briton are also...

One more effect is the MAGNUS EFFECT. Since you are from Holland, you would know something about cricket. Magnus effect takes place when a fast bowler swings the ball. Read more about this and find out how bullets are designed to combat the magnus effect

Both your solutions seem to be perfectly right. :cool: