Recent content by Physic_Scholar

So from conservation of energy, you only have kinetic energy of bullet 1/2mv^2 whic is set to equal the latent heat of Q=mL. The units of mass cancels and so you just have v= to the value of the latent heat constant in kcal/kg? How do I convert to speed? Can someone help me? I don't know how...

At a crime scene, the forensic investigator notes that the 8.2 g lead bullet that was stopped in a doorframe apparaently melted completely on impact. Assuming the bullet was fired at room temperature (20 degrees celsius), What is the minimum muzzle velocity of the gun that fired the bullet...

I see the reasoning for this it makes me understand physics a little better and lead me to how I should begin the problem. Thanks.

What about the temperature how to figure? how much less air to keep P and V constant?

Thanks. That really helped. I just have 1 more physics question from the homework that couldn't get but I made an effort on it so if you have any idea what I'm doing wrong on this please tell me. The question states: A hot air ballown achieves its buoyant force lift by heating the air inside...

so P1/P2=V2/V1. Assuming, at the top it is atmospheric pressure then it is 1 atm. Underwater P1=rho(g)(h)=(1*10^3kg/m^3)(9.8m/s^2)(10m) so that gives 98000 atm. V1=5.5L so solving for V2 we get 53900L which is not possible what am I doing wrong?

i know what those stand for and u didn't mention "n." The problem is HOWto start the problem or figure the numbers given what I posted. You also don't know temperature "T" or should I assume it is all at STP? How come no one know this one to at least help me get started? This only Physics 102...

any idea anyone? I really need help.

The Problem" If a scuba driver fills his lungs to full capacity of 5.5L when 10 m below the surface, to what volume would his lungs expand if he rose to the surface? Is this advisable? I really don't know where to go with this. I started with pv=nRT so rho(v)gh=nRT but there are still too...

ok I had those equations I just didn't think what to do. CAn you help me with this problem also: At a rock concert, a dB meter registered 130 dB when placed 2.8m in front of a loudspeaker on the stage. What is the power output of the speaker, assuming uniform spherical spreading of the sound and...

Does anyone know the answer to this problem?

Work is defined as force (parallel) component multiplied by the distance.Remember to label all the forces acting on this object of mass 100g.

Ok I need guidance on how to approach this problem. The problem is as follows: A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 3.5s later. How high is the cliff?