Would N be higher or lower in an elliptical galaxy? Explain
What will be an ideal response?
Much lower, for star formation ceased long ago, and the Population II stars in these galaxies are not rich in the heavier elements vital to the complex chemistry of LAWKI. Much of our technology is also vitally tied to heavy elements like iron and even uranium.
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A 3.0-kg mass moving in the positive x direction with a speed of 10 m/s collides with a 6.0-kg mass initially at rest. After the collision, the speed of the 3.0-kg mass is 8.0 m/s, and its velocity vector makes an angle of 35° with the positive x axis. What is the magnitude of the velocity of the 6.0-kg mass after the collision?
a. 2.2 m/s b. 2.9 m/s c. 4.2 m/s d. 3.5 m/s e. 4.7 m/s
Who discovered the nucleus of the atom in 1911?
a. Thomson b. Rutherford c. Dalton d. Bohr
A 2.5-kg box, sliding on a rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring (see the figure)
The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until is comes to a momentary halt, is -0.50 J. (a) What is the spring constant of the spring? (b) What is the coefficient of kinetic friction between the box and the rough surface? What will be an ideal response?
Which isotope of hydrogen is radioactive?
a. Protium b. Tritium c. Deuterium d. Hydronium