Problem 5.16 9 of Constants | Periodic A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28 ° above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 28 N. Part A What is the mass of the box? Express your answer using two significant figures. V ΑΣφ kg т%3 Request Answer Submit Provide Feedback
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
please help me with this, its a pracitice problem, NOT GRADED, DOUBLE CHECK ANSWERS, previous tutors got it wrong
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