A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J
b. 62 J
c. 20 J
d. 44 J
e. 24 J
a
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About 2% of our solar nebula consisted of elements besides hydrogen and helium. However, the very first generation of star systems in the universe probably consisted only of hydrogen and helium
Which of the following statements is most likely to have been true about these first-generation star systems? A) There were no comets or asteroids in these first-generation star systems. B) Jovian planets in these first-generation star systems had clouds made of water and other hydrogen compounds. C) These first-generation star systems typically had several terrestrial planets in addition to jovian planets. D) Like the jovian planets in our solar system, the jovian planets in these first-generation systems were orbited by rings.
A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?
What will be an ideal response?
The energy of a body moving across a horizontal surface is an example of kinetic energy
a. True b. False Indicate whether the statement is true or false
A hornet circles around a pop can at increasing speed while flying in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down. b. down and inwards. c. down and outwards. d. down and backwards. e. down, backwards and outwards.