Recent content by Dennis Heerlein

That makes sense. Thanks a bunch, I appreciate it.

Homework Statement The elliptical orbit of a comet is shown above (hidden document I apologize but easy to picture). Positions 1 and 2 are, respectively, the farthest and nearest positions to the Sun, and at position 1 the distance from the comet to the Sun is 10 times that at position 2. What...

:( I stared at that for 30 minutes, thinking I was using conservation of momentum and not conservation of energy. Thank you for reading that block of text and helping me though! Much appreaciated

Homework Statement A ballistic pendulum is a device that may be used to measure the muzzle speed of a bullet. It is composed of a wooden block suspended from a horizontal support by cords attached at each end. A bullet is shot into the block, and as a result of the perfectly inelastic impact...

Homework Statement An object of mass m is allowed to slide down a frictionless ramp of angle θ and its speed at the bottom is recorded as v. If this same process was followed on a planet with twice the gravitational acceleration as Earth, what would be its final speed? Homework Equations The...

Okay. If a full lap around the circle is made then the average velocity would be zero due to zero displacement. But what does the formula 2pir/T measure then?

Average speed would be 2pi m/s? Average velocity would be 4m/s?

This is exactly as stated, word for word. So can you explain who is wrong, and the difference of those you stated?

This is the question: During a time interval of 5 seconds, an object moves through a half circle with a radius of 10 meters, as shown above. What is the magnitude of the object's velocity during this motion? Note: I do not know how to post the diagram, but it simply shows a curved arrow going...

Thank you

My physics SATII book states that this is not an example of nuclear fusion: 4/2 He + 27/13 Al ⇒30/15 P +1/0 n If this isn't fusion then what is it? (The top number of the division is the mass; the bottom is the atomic number)

Oh, very well. The book has been using 10 so there is the mix-up. Thank you again

So the angle would be thirty, and their answer is wrong? (An angle of 30 yields an answer of exactly one, and since you said it is one of the answers I assume my angle is still off?) By the way, thank you so much for your patience and time

Isn't the angle 120 in my case?

Two questions: What is done from there? If the length of the string was 40 cm would my original attempt be correct?