Recent content by motionman04

Wait, but I did set that as Rfinal, four times the Earth's radius, and came out with the answer that I got before. Am I supposed to do it based on 5x the radius? If that is so, I'm kinda confused :confused:

I see what you mean, so what would Rfinal be? Its 2AM, the reason why I'm asking stupid questions :smile:

Well, I used (6.37x10^6)(4), to get Rfinal, since that is the Earth's radius times 4, and I use 6.37E6 for Rinitial, since the particle starts on the Earth's surface. Of course, G and M are constants, and I used 1070 for the mass of the object. Plugging everything in, I get -...

hmm, I tried with the signs, however, looks like there's something up with the number I'm getting

How much energy is required to move a 1070 kg object from the Earth's surface to an altitude four times the Earth's radius? Having problems with this question. I figure it would be GMm(1/r(final) - 1/r(initial)), with the final being 4x Earth's radius, and initial being Earth's radius. I...

Anyone know how to solve this problem?? I figured out that you have to get the radius of the front sprocket, and plug that into the v=rw formula. However, I still get a wrong answer.

4. [PSE6 10.P.014.] Figure P10.14 shows the drive train of a bicycle that has wheels 67.3 cm in diameter and pedal cranks 17.5 cm long. The cyclist pedals at a steady angular rate of 73.5 rev/min. The chain engages with a front sprocket 15.2 cm in diameter and a rear sprocket 7.45 cm in...

Well I did some conversions to obtain 18.05 m/s as the velocity of the first car, but still kinda unsure of where to go from there.

How long does it take an automobile traveling in the left lane at 65.0 km/h to pull alongside a car traveling in the same direction in the right lane at 45.0 km/h if the cars' front bumpers are initially 100 m apart?

I divided that by 60 to get .504 m/s, where do I go from here?

oo okay, I solved 190=2pir and got 30.239 m

2pi(190) i get 1193.8 meters

Well I tried 2pi(.300), but I'm wondering if you have to convert the rev/minute

6. [PSE6 4.P.029.] A tire 0.300 m in radius rotates at a constant rate of 190 rev/min. Find the speed of a small stone lodged in the tread of the tire (on its outer edge). (Hint: In one revolution, the stone travels a distance equal to the circumference of its path, 2r.) m/s What is the...

O never mind