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The Sojourner rover with the Mars Pathfinder used a entry, descent, and landing system involving airbags to land on Mars. The Spirit and Opportunity rovers each used more-or-less the same system involving airbags to land on Mars.
The Curiosity rover with the Mars Science Laboratory (MSL) used a very different landing system, including "seven minutes of terror".
Why did NASA engineers select such an apparently complicated landing system for MSL?
How do rocket scientists calculate the impact forces for a Mars landing for a given proposed landing system, when no one has ever used that landing system on Mars ever before?
How do aerospace engineers choose a landing system?
Two concentric metallic spheres of radii r1 and r2> r1, respectively, are maintained at temperatures T1 and T2, and are separated by a layer of homogeneous material thermal conductivity k.
A 87 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 26.64, find the heat gained by the water
An object is 28.0 cm from the center of a silvered spherical glass Christmas tree ornament 6.50 cm in diameter. What are the position and magnification of its image? (Use the correct sign conventions.) position _______________cm from the surface imag..
The U.S. Army's parachuting team, the Golden Knights, are on a routine jumping mission over a deserted beach. With what average force did the parachuter hit sand
On a hot day, the temperature of a road surface may rise to over 50 degrees C. calculate the net radiation flux from the road to the air
A supertrain of proper length 200 m travels at a speed of 0.9 times the speed of light (relative to the tunnel) as it passes through a tunnel having proper length 80 m. how much longer is the train than the tunnel
Mass of the earth is 5.97 x 1024 kilogram. The radius of its orbit around the Sun is 1.5 x 1011 meter. The orbiting period is 1 y (365.3days). Find the force (magnitude and direction) between the Sun and the Earth
The voltage across a two terminal device is always 15.0 V. The maximum power the device can dissipate is 0.87 W - Determine the maximum current magnitude allowed by the device power rating.
A person Walks 25 m west and then 45m at an angle of 60 degrees north of east. Estimate the magnitude of the displacement
At what temperature does a carbon resistor have a resistance of 995ohms, if it has a resistance of 1000 ohms at 20 degrees? What is its conductivity at the new temperature
An object 0.480cm tall is placed 14.0cm to the left of the vertex of a concave spherical mirror having a radius of curvature of 21.0cm, Find the orientation (erect or inverted) and the nature (real or virtual) of the image
The pressure in the fluid at the distance from the axis of rotation is. You may ignore the variation in pressure with depth; suppose that it is much smaller than the variation in pressure with radius.
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