Apoint (a) show that the neutron flux at the distance r from the source is given by source emits s neutrons/sec isotropically in an infinite vacuum 4πr2. (b) what is the neutron current density vector at the same point? [note: neu trons do not diffuse in a vacuum.

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

The speed of light can be used to measure the

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?