# Search results

1. ### Still trouble with time dilation

Homework Statement The Apollo astronauts returned from the moon under the Earth's gravitational force and reached speeds almost 25,000 mi/h WRT Earth. Assuming (incorrectly) they had this speed for the entire trip from the moon to Earth, what was the time difference for the trip between...
2. ### Time Dilation and gravity

Homework Statement The Apollo astronauts returned from the moon under the Earth's gravitational force and reached speeds almost 25,000 mi/h WRT Earth. Assuming (incorrectly) they had this speed for the entire trip from the moon to Earth, what was the time difference for the trip between...
3. ### Midpoint Rule Confusion

Homework Statement I'm working on a practice test and got stuck on the question: Approximate the length of the curve y=√x, 0≤x≤1 by the midpoint rule with n=4 and ∆x=0.25. Homework Equations Is the midpoint rule the same thing as Simpson's rule? I don't remember going over the midpoint...
4. ### Find the volume of a frustum of a right circular cone

Find the volume of a frustum of a right circular cone with height h, lower base radius R, and top radius r. I don't want the answer. I want to know how to do this. My math teacher gave all of these problems for the class to do, but didn't explain anything. Are there equations that I can...
5. ### Specific heat of alloys

I have an alloy and found the average specific heat of the metal to be 289 J/kg°C. I need to know what type of metal it is. I've looked at several different tables of specific heats, but can't find what I'm looking for. Can anyone help me?
6. ### Physics I'm thinking about going into physics. What are career opportunities?

I'm thinking about going into physics, but I was wondering what kind of careers will physics lead me to.