Sökning: "vad är gravitation"

Visar resultat 1 - 5 av 16 uppsatser innehållade orden vad är gravitation.

1. 1. Svenska gymnasieelevers uppfattningar om storlek och avstånd i universum

   Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Fysiska institutionen; Lunds universitet/Institutionen för utbildningsvetenskap

   Författare :Karolin Nilsson; [2023]
   Nyckelord :Astronomy; Misconceptions; Educational Research; Science Education; High School Students; Physics and Astronomy;

   Sammanfattning : This study aims to investigate how students in Swedish upper secondary school conceptualize sizes and distances of some astronomical objects, such as planets and stars, as well as the students’ general knowledge of the objects themselves. The study uses a constructivist framework and explores how well the students’ conceptions match the scientific facts and definitions, and what misconceptions and alternative conceptions they hold. LÄS MER

3. 2. Search for transiting exoplanets in globular clusters

   Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

   Författare :Oskar Nilsson; [2023]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : This project consists of a transit search in the Messier 3 Globular cluster with the goal to assess the difficulties of observing planetary transits in globular clusters. M3 was observed for a short period of time and by performing PSF fitting, flux measurements could be done to extract light curves of the 290 stars that are included in this project. LÄS MER

4. 3. Hyper-velocity stars from globular clusters hosting intermediate-mass black holes

   Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

   Författare :Matilda Skantz; [2023]
   Nyckelord :Hypervelocity stars; run-away stars; stellar binary; intermediate mass black hole; globular cluster; Hills mechanism; Physics and Astronomy;

   Sammanfattning : In 1988 Hills proposed that stars can gain velocities above 500 km s−1 if they are in a stellar binary which gets disrupted by a super massive black hole (SMBH). One of the stars would get trapped in an elliptical orbit around the SMBH while the other gets ejected and obtains a relatively high velocity. LÄS MER

5. 4. N-body Simulations in Galactic Potentials

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :David Andersson; [2019]
   Nyckelord :N-body; simulation; spen clusters; dissolving time; Hyades; members of the Hyades; double integration; Physics and Astronomy;

   Sammanfattning : What effect does a collision between two clusters have on their dissolving time? In order to answer this question, a new type of N-body simulation using a double integration of a cluster was built. Instead of introducing a perturbation representing the gravitational force of the Milky Way into a local simulation of the cluster, the cluster orbit was integrated in the potential of the Milky Way, and in each of these integration steps the local motion of the stars inside the cluster were integrated, using an N-body calculation. LÄS MER

7. 5. The fate of pebbles and planetesimals entering protoplanetary envelopes

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Emil Zadera; [2019]
   Nyckelord :Planet formation; planet; protoplanet; protoplanetary envelope; protoplanetary atmosphere; protoplanetary growth; planetary growth model; accretion rate; vapour blob; vapourblob; vapour planet; transport of water; water on planet; pebbles; planetesimals; pebble accretion; planetesimal accretion; meteors; ablation; fragmentation; sublimation; protoplanetary disk; MMSN; accretion window; accretion channel; accretion; destruction; disruption; terminal velocity; gas; gasflow; shearingbox; exoplanet; Physics and Astronomy;

   Sammanfattning : Planetary embryos grow by the accretion of solid dust-material, ranging from cm- to m-sized pebbles up to km-sized planetesimals. However, the underlying size-distribution of the accreted material is poorly understood. LÄS MER