A guitar amplifier during a solo at a rock concert produces sound with a power of 40 W. Assume that the sound waves emit and spread spherically. A) What is the intensity of the sound waves as they reach a fan in the front row 16 meters from the amplifier?

B) What about in the back, 53 meters away?

Tungsten-filament lightbulb emits light based on the temperature of the filament. which phenomenon does this demonstrate?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

You add 800 ml of water at 20c to 800 ml of water at 80c what is the most likely final temperature of the mixture ? a. 100c b. 60c c. 25 c d.50c