Port-wine birthmarks, which are caused by malformed capillaries close to the skin, can be removed with laser pulses. laser light of the right color will pass through the skin with little absorption but will be strongly absorbed by oxyhemoglobin in the blood of these capillaries, which destroys them without damaging adjacent tissue. a typical system uses a series of 6900 w pulses of 585 nm laser light. each pulse lasts 0.45 ms. how many photons are in each pulse?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Urgent pls a. coal consumption levels off and remains flat. b. petroleum, natural gas, and renewables show an increase in consumption c. more nonrenewable resources continued to be consumed than renewable. d. there is little projected increase in nuclear energy use. e. carbon dioxide emissions are projected to decline as we approach 2040. global energy consumption is defined as the total energy used by an individual or organizations from around the world. use the graph above to analyze the projected energy consumption from now until 2040. which statements in the prompt apply? a) a, b, d b) b, c, d c) a, c, d d) a, b, c, d

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car