Estimate the luminosity of a 1 solar mass protostellar cloud, which collapses from an initial radius of 10^3 au down to a solar radius, over a timescale of 40 million years by radiation of its gravitational potential energy, in the units of the present solar luminosity:

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

An artificial satellite circles the earth in a circular orbit at a location where the acceleration due to gravity is 6.03 m/s^2. determine the orbital period of the satellite.

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.