Angular Momentum of a Rock?

a 0.23-kg rock is tied to a string and whirled in a circle with a radius of 0.82m. The speed of the rock is 3.5 m/s What is the angular momentum?

How accurate are ultrasounds for dating pregnancy?

it is just a estimated due date within a two week time frame. my son was a very large baby and they said he was two weeks overdue when he was only 38 weeks that is why it's a ESTIMATED DUE DATE

Please tell me if pregnant or not?!?

My sister had sex last Friday 06/24/11 she was so upset about it. Lord forgive her though. They day after she took the Plan B pill. And earlier today she went to pee and she noticed like a light blood in her underwear. We googled and it said implantation but then we looked up side effects of the Plan B pill and it said within a week it makes most women bleed and knocks their cycle off track. It said the bleeding starts off light and then eventually gets lighter. She had her period the week before last so basically 3 weeks. Can someone please tell me do you think she is pregnant or do you think that she is not?

8th Gym badge in soul silver?

I beat the gym leader and am in the cave on the lake but I cant get across the whirl pool to get to the dragon shine becuase I don't have here badge which i get at the dragon shine help please its confusing?

What is this black metal music video?

Did it he have some sort of awkward horns on his head? It was probably something by Dimmu Borgir, but You're going to have to be a bit more specific.

What is your favorite question that you have asked on y!a?

Mine would be "If I were to start chanting "DESTROYA!", would you chant with me or stare?" (The majority said yes. XD)

I had severe lower abdominal ache:(?

yesterday suddenly i developed lower abdominal ache.i thought it was appendicitis as it was radiating to right side..it was very sever,and continuous.i went to emergency,i was given dicloran n gravinate n 1000 ml saline...dr asked me for ultrasound abdomen n pelvis.pain got relieved after 2 hours..i got my abdominal ultrasound done.dr said its mild pelvic ascites.and left ovarian mass..it can b cyst or mid cycle follicle.my lmp was 13 june 2011...i got my complete blood count done and urine routine examination.ivnt got report yet.bt now m having blotting n mild ache n tenderness in lower abdomen...what it cud b..im afraid..does it happen to girls..why did pelvic ascites develop..help me im tensed..im myself a medical student,,but im just confused