Astronauts in a space shuttle that orbits the Earth are in a state of "free fall" that makes them appear to be weightless. If an astronaut brings a helium balloon to a pressurized room of a space shuttle while it is in orbit, what would the helium balloon do?
1.It would float to the top of the cabin.
2.It would sink slowly to the bottom of the cabin.
3.It would remain wherever it is placed.
4.It would remain at whatever height it is placed, but it would move horizontally to one side of the cabin.
3
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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
Describe some characteristics that all the planets seem to share and use the solar nebula theory to explain them
What will be an ideal response?
Which dwarf planet did the NASA Dawn spacecraft enter into orbit around in 2015?
A) Pluto B) Eris C) Ceres D) Haumea
A single conservative force Fx = (6.0x ? 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0 . What is the potential energy at x = 3.0 m?
a. +11 J b. +29 J c. +9.0 J d. ?9.0 J e. +20 J