PHSC 121 Exam 2024-2025 Edition. Questions & Correct Answers. Graded A+, Exams of Physics

Download PHSC 121 Exam 2024-2025 Edition. Questions & Correct Answers. Graded A+ and more Exams Physics in PDF only on Docsity! PHSC 121 Exam 2024-2025 Edition. Questions & Correct Answers. Graded A+ - ANSDescribe the idea of the mythical sunstone and how it required at least basic knowledge of the motions in the heavens to use it. -50 degrees - ANSIf you live at 40 degrees north latitude, what declination value for stars would make them impossible to view from your northern location? 0.5 pc - ANSA star is measured with a parallax angle of 2" (arc seconds). How distant is the star in parsecs? 0h - ANSWhat is the right ascension of the sun in the sky on the vernal (spring) equinox? 1. The planets are in an elliptical orbit with the sun as the one focus. 2. The planets have an equal orbit to the space they are in. The space is equal between each planet. 3. T^2/a^3 - ANSList two of Keplers three laws of planetary motion 18h - ANSWhat is the right ascension of the stars on your meridian at midnight on the summer solstice? 1x10^8 - ANSHow do you write million in scientific notation? 2 - ANSHow many tides are there per day at most locations on earth? 23.5 degrees - ANSWhat is the declination of the sun on the summer solstice? 400.4 nm - ANSA very distant galaxy emits light at 400 nm, but is moving away from earth at 300km/s. What wavelength is measured? 4h - ANSWhat is the right ascension of the stars on your meridian at 10pm on the winter solstice? 5000 years - ANSHow long ago was astronomy first practiced? 700MPc - ANSAt what rate is a galaxy 10MPc from earth receding from us? Use H=70km/s/MPc A satellite tracking earth from two different positions in orbit - ANSDistance of stars measured by parallax is done from A. Dark matter - ANSWhich of the following accounts for the fact that there is more mass and gravity in galaxies we see than can be detected in ordinary matter (which leads to faster galactic rotation than we'd otherwise expect)? A. Dark matter B. Dark energy C. Gravity D. Hubbles law A. Shrapnel moving apart after the detonation of the grenade - ANSWhich one of these does not belong? A. Shrapnel moving apart after the detonation of the grenade B. Galaxies moving apart due to expansion of space C. Dots on a balloon moving apart as the balloon is inflated D. Raisins moving apart during the baking of raisin bread An absorption spectrum - ANSThe spectrum we see from the sun today Approaching earth - ANSA star's light is blue shifted when viewed from earth. The star is B. A recedes 5 times faster than B from earth - ANSGalaxy A is five times farther away from earth than Galaxy B. Which of the following is true of their velocities: A. A recedes 25 times faster than B B. A recedes 5 times faster than B from earth C. A approaches earth 5 times faster than B D. A approaches earth 5 times faster than B B. Dark energy - ANSWhich of these accounts for the fact that the universe is not only expanding, but speeding up in the process? A. Dark matter B. Dark energy C. Gravity D. Hubbles law Babylon - ANSWhich culture/country seems to get far less credit than it deserves in terms of ancient science and technology? C - ANSWhy is it impossible to make an accurate drawing of the solar system? A. We don't know what all the objects actually look like B. It is impossible to determine the real distances and sizes of the objects precisely C. The space between the objects is so vast that showing it to scale would render the objects invisible D. It IS possible to make an accurate drawing. They are all over Google. Cepheid and Type 1 A - ANSList two standard candles in astronomy