Recent content by Foehammer

Awesome! Thank you so much for your help. It was greatly appreciated. Have a great day!

So KE+PE=0 .5mv^2+(-GmM/r)=0 .5mv^2=GmM/r Which would get rid of my negative allowing me to find the proper answer. Is that line of thought correct?

Hmm, would it be 0? Since PE gets negative as KE becomes positive when we start moving towards Earth. Initially it wasn't moving and PE was 0 so 0+0=0

Alright, so eventually it would have to hit Earth which is why it gives me the Earth's radius as the stopping distance. So.. .5mv^2=-GmM/r m's cancel .5v^2=-(6.7*10^-11)*6*10^24/(6.4*10^6) v^2=-125,625,000 My only hiccup now is you can't take the square root of a negative number? Would it be...

Potential energy would decrease as it got closer, but if the starting potential energy is 0 does that make the potential energy become negative?

Oh, a thing I just thought of is conservation of energy, but given that initial potential energy is 0 equating that to .5mv^2 would do me no good as v would be 0 to make that work.

The physical quantities I know are what is given in the problem statement. Mass of earth, radius of earth, the gravitational constant, and the distance between Earth/asteroid (infinity). I know from the equation of potential energy that when it is at infinity the potential energy is 0. My...

Weight of both Earth/Asteroid, acceleration from Earth's gravity on asteroid. I don't know of anything else that may pertain to the problem though. Direction maybe?

Homework Statement An asteroid which strikes the Earth starts from rest a very large distance r from the Earth (say r = ∞). What will its speed be when it hits the earth? (Use M = 6.0×1024 kg, r= 6.4×106 m, G = 6.7×10-11 m3 kg-1 s-2) Homework Equations [/B] U=-GmM/r F=GmM/r^2 The Attempt...

AAhh alright. Thank you for clearing that up. I see the relationship now and it makes sense. Thanks again!

Alright here it is: B x C=D=44i+94j-48k D as a unit vector is: .3849i+.8221j-.4198k A dot D=8.169 8.169=8.775*1*cos(phi) phi=21.418 Using this new angle it comes out to be: 8.77*cos(21.418)=8.164 So, one thing I noticed was that in my original post I did C x B and you recommended B x C...

Homework Statement [/B] Here are two displacements, each measured in meters: A. 4i+5j-6k B. -1i+2j+3k What is the component of A that is perpendicular to the direction of B and in the plane of A and B.? Homework Equations The book gave me a hint to use this equation...

Got it. Thanks a lot!

Homework Statement A Celsius and a Fahrenheit thermometer are dipped in boiling water. The temperature of the water is brought down until the Fahrenheit thermometer reads 140°. So, the fall in temperature registered by Celsius scale is: 30 40 50 80 Homework Equations F=(C*(9/5))+32...