Recent content by linnus

Homework Statement 100 ton rocks are "thrown" from the moon to the earth. (a) Calculate the location of the point, between the Earth and the Moon, where the gravitational field strength is zero. Give your answer in km, from the center of the Earth. (b) What is the difference in PE between the...

Homework Statement A geosynchronous satellite is stationary over a point on the equator (zero degrees latitude) at the same longitude as Seattle, Washington. Seattle's latitude is 47.6°. If you want to communicate with the satellite, at what angle above the horizon must you point your...

I think it means the midway of the rod.

Homework Statement 0.14 meter long, 0.15 kg thin rigid rod has a small 0.22 kg mass stuck on one of its ends and a small 0.080 kg mass stuck on the other end. The rod rotates at 1.7 rad/s through its physical center without friction. What is the magnitude of the angular momentum of the system...

The acoustic resonance that they got was around "25.5kHz and another at 25.1kHz at room temperature". Mine was around 25.18kHz, which is really close to what they got. I did vary the voltage a bit after 4 volts was not working out for me, but I didn't change it that much. I'll play with it a...

I am trying to do a sonoluminescence experiment. The instructions are from this site: http://www.techmind.org/sl/. I have everything set up today, but I think my way of making the bubble is wrong. From the description of the site, it seems like when you make the bubble it should easily go to...

When they say K=1/2mv^2 does K mean the change of kinetic energy? because Wtotal= the change of kinetic energy...

hmm i know F,friction= coef friction x normal force...but its still not helping me

Homework Statement Fifteen clowns are late to a party. They jump into their sporty coupe and start driving. Eventually they come to a level curve, with a radius of 31.5 meters. What is the top speed at which they can drive successfully around the curve? The coefficient of static friction...

hmm so was my method right?

Homework Statement Car A with mass 2400 kg is moving along a straight stretch of road at 45 miles per hour. Car B with mass 1100kg follows with speed 65 miles per hour. How fast is the center of mass of the 2 cars moving? Homework Equations Xcm=(M1X1+...+MnXn)/ (M1+...+Mn) The...

I have no idea where this goes... But I have a question. Say if the sun was big enough to turn into a black hole, what will happen to the earth? Will it stay in the same orbital path or will it be suck in by the black hole? Thanks

Homework Statement A 10.5 kg block, attached to the left end of a horizontal massless spring, sits on a frictionless table. The right end of the spring is attached to a vertical piece of wood that is firmly nailed to the table. A 0.0500 kg projectile is fired, from left to right, into the...

i got it, thanks

Homework Statement On a frictionless surface, a 0.35 kg puck moves horizontally to the right (at an angle of 0°) and a speed of 2.3 m/s. It collides with a 0.23 kg puck that is stationary. After the collision, the puck that was initially moving has a speed of 2.0 m/s and is moving at an angle...