A 5.0-kg mass with an initial velocity of 4.0 m/s, east collides with a 4.0-kg mass with an initial velocity of 3.0 m/s, west. After the collision the 5.0-kg mass has a velocity of 1.2 m/s, south. What is the magnitude of the velocity of the 4.0-kg mass after the collision?
a. 2.0 m/s
b. 1.5 m/s
c. 1.0 m/s
d. 2.5 m/s
e. 3.0 m/s
d
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According to our theory of solar system formation, why do all the planets orbit the Sun in the same direction and in nearly the same plane?
A) The original solar nebula happened to be disk shaped by chance. B) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system. C) The laws of conservation of energy and conservation of angular momentum ensure that any rotating, collapsing cloud will end up as a spinning disk. D) The Sun formed first, and as it grew in size it spread into a disk, rather like the way a ball of dough can be flattened into a pizza by spinning it. E) It is a coincidence, as we would expect that most other solar systems would not have all their planets orbiting in such a pattern.
A car of mass 1689 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic
If the velocity of the truck is 17 km/h (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car? A) 19 km/h B) 38 km/h C) 29 km/h D) 10 km/h
A stream of a certain liquid compound is attracted to an electrically charged rod. The compound is probably
a. metallic. b. nonpolar covalent. c. ionic. d. polar covalent.
If two slide projectors are connected in parallel across the same 120 volt source, the current drawn from the source remains at 6 amperes
Indicate whether the statement is true or false