According to Newton, the gravity of the ________ is needed to explain planetary orbits
Fill in the blank(s) with correct word
Sun
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Air 1000°C flows at an inlet velocity of 2 m/s between two parallel flat plates spaced 1 cm apart. Estimate the distance from the entrance to the point where the boundary layers meet.
GIVEN
Air flows between two parallel flat plates
Air velocity (U?) = 2 m/s
Plate spacing (S) = 1 cm = 0.01 m
FIND
The distance from the entrance (xc) where the boundary layers meet
ASSUMPTIONS
Steady flow
Air is dry and at a temperature of 1000°C
SKETCH
Which of the following is not evidence supporting the giant impact theory for the formation of the Moon?
A) Computer simulations show that the Moon could really have formed in this way. B) The composition of the Moon is similar to that of Earth's outer layers. C) The Moon is depleted of easily vaporized materials, as we would expect from the heat of an impact. D) Scientists have found several meteorites that appear to be the remains of the object that caused the giant impact. E) We see signatures of giant impacts on other planets.
How can Mars, a planet with so little atmosphere, have so much wind?
What will be an ideal response?
As a car goes up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to:
a. the weight of the car times the coefficient of kinetic friction. b. the normal force of the road times the coefficient of kinetic friction. c. the normal force of the road times the coefficient of static friction. d. zero.