What is stellar nucleosynthesis?
A) the formation of heavier elements inside stars
B) the formation of planetary nebulae by red giants
C) the formation of stars from a nucleus of contracting material
D) the formation of white dwarfs, neutron stars, and black holes from stars
E) the process by which stars form interstellar dust
A
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Two boxes are connected by a weightless cord running over a very light frictionless pulley as shown in the figure. Box A, of mass 8.0 kg, is initially at rest on the top of the table
The coefficient of kinetic friction between box A and the table is 0.10. Box B has a mass of 15.0 kg, and the system begins to move just after it is released. (a) Draw the free-body diagrams for each of the boxes, identifying all of the forces acting on each one. (b) Calculate the acceleration of each box. (c) What is the tension in the cord? What will be an ideal response?
Which will cool a drink faster?
A) ice cubes B) crushed ice C) no difference for the same mass of ice
Identical masses m are attached to identical springs of spring constant k suspended from the ceiling. With both masses hanging in their equilibrium positions, mass A is pulled down 10 cm and released while mass B is pushed up 10 cm and released. Which statement is correct?
a. Mass A will travel a smaller distance to its highest point than mass B will travel to its lowest point. b. Mass A will travel a greater distance to its highest point than mass B will travel to its lowest point. c. Masses A and B will travel equal distances between their highest and lowest points. d. More work was done on mass A by the extending force than on mass B by the compressing force. e. The total work done on mass A by the extending force was equal to the total work done on mass B by the compressing force.
Stellar spectra tell us that ________ is the second most abundant element in the Sun
A) carbon B) helium C) iron D) hydrogen E) oxygen