Which material best absorbs sound waves in a room?
a. heavy curtains
b. hardwood floors
c. brick walls
d. cement floors
Why?
If anyone can answer this, it would mean a lot!!

What is special about a dc circuit ?

Apatient has a history of poor nutrition. he has skin rashes, bleeding gums, and a cut that hasn’t healed in a long time. what vitamin deficiency most likely caused this symptom?

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass