Recent content by ahrog

Thanks. Another question though. How would you find the distance in which an object can be seen clearly from by just using the number 2.5 (and possible 2.1 and 2.3)?

Focal Length of 2.5? Wow, that seems...too simple?

Homework Statement The diagram shows the eye of a person with normal vision looking at an object that is very far away. a) Determine the focal length of this persons eye. b) Later in this person's life, the focal length will change to between 2.1 cm and 2.3 cm. Will this person suffer from...

Okay, that makes sense. So all I have to do is change the n to 1.00 and it'll work. Thanks!

Homework Statement The index of refraction for a diamond for red light, 656 nm, is 2.410, while that for blue light, 434 nm, is 2.450. Suppose white light is incident on the diamond at 30.0 degrees. Find the angles of refraction for these two colors. Homework Equations n1sinangle of...

Homework Statement Ole Roemer found that the maximum increased delay in the appearance of Io (a moon of Jupiter, I believe) from one orbit to the next was 14 seconds. a) How far does light travel in 14 seconds? b) Each orbit of Io is 42.5 h. Earth traveled the distance calculated above...

I got the falling part time to be 5 seconds. And for the time for the sound to return, how do I figure that out? If the velocity for the sound is wavelength x frequency which I have only the wavelength, how can I find the time?

Homework Statement 1. Water waves in a lake travel 4.4m in 1.8s. The period of oscillation is 1.2 s. a) What is the speed of the water waves? b) What is the period of the water waves? 2. A group of swimmers is resting in the sun on an off-shore raft. They estimate that 2.0m separates...

Homework Statement Someone drops a stone into a mine shaft 122.5 m deep. How soon after she drops the stone does she hear it hit the bottom of the shaft? Homework Equations v= wavelength x frequency The Attempt at a Solution I changed the equation to be: d/t=wf t=d/wf...

Oh geez *smacks head* Such an easy solution. Thanks!

Homework Statement A pendulum with is 2.00 m long makes 84.5 complete oscillations in 4.00 minutes. What is the acceleration of gravity at that spot? Homework Equations TG=(4pi^2/T^2)L The Attempt at a Solution g=(4pi^2/240s^2)2.00m g= 0.0013707... Which doesn't make...

The link wouldn't load for me,(apparently the The network link was interrupted while negotiating a connection. Please try again.) but it did inspire the idea of space being like a vacuum, and that sound cannot travel in it, so the explosion due to sound wouldn't happen. Thanks :)

Homework Statement In a science fiction movie, when a spaceship explodes, the vibrations from the sound nearly destroy a nearby spaceship. If you were the science consultant for the movie, what would your advice be for the producer? Homework Equations I don't think there are any...

I'm sorry (I must be dumb) I still don't understand.

Thank you, that helped a lot! I could now answer the questions, saying that the pendulum length increases and decreases as the milk drains out.