What, according to the lecture, is one of the fundamental questions in astrophysics? What are stars made of? Why do stars shine? Where do stars come from? How do stars move?

A radioactive compound with mass 240 grams decays at a rate of $30\% $ per hour, Which equation represents how many grams of the compound will remain after 4 hours? Answer $C=240(1.3)^{4}$ $C=240(1-0.3)(1-0.3)$ $C=240(1+0.3)^{4}$ $C=240(0.7)^{4}$

7. Why do you think the plastic and the finger are attracted to each other? Your answer

Which unit would be most useful for describing the distance to a galaxy cluster located from Earth? Light-years Astronomical units Parsecs Kllometers

You can increase pressure by increasing the force applied to a given area True False

An object experiences a buoyant force of 15.9 N when immersed in a fluid of density $917kg/m^{3}$ What is the volume of the object? $[?]m^{3}$

Which of the following is a path function? Pressure $(P)$ Volume $(V)$ Temperature $(T)$ Work $(w)$

Evidence Card G:What is the effect of distance between the car and launcher on the potential energy in the system? Magnets close together Initial potential energy. Number of grid points between magnets: __ Magnets a medium distance apart Initial potential energy. Number of grid points between magnets: __ Magnets far apart Initial potential energy. Number of grid points between magnets __

5. The driver of a train travelling at $40m/s$ applies the brakes as the train enters a station. The train slows down at a rate of $2m/s$ The platform is 400 m long. Will the train stop in time?

The earth's atmosphere exerts a pressure on all objects which it is in contact. True False

Complete the statement. A system's thermal energy is defined as __ . Choose 1 answer: A surroundings (A) the heat that transfers from the system to the B the average kinetic energy of its particles.