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
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A stack 60 m high by 5 m in diameter has an average temperature of 300ºC on its outer surface when exhaust gases pass through it. Estimate the heat loss from the stack into still air at 25ºC.
What will be an ideal response?
According to Kepler, the paths of planets about the Sun are
A) parabolas. B) circles. C) straight lines. D) ellipses. E) none of the above
Which planet listed below has the most extreme seasons?
A) Jupiter B) Earth C) Mars D) Uranus
The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere
a. True b. False Indicate whether the statement is true or false