Although the thermosphere is considered part of Earth's atmosphere, the air density is so low we normally think of it as outer space. The space shuttle and the International Space Station both orbit Earth within the thermosphere. Much of the Sun's UV and x-ray radiation are also absorbed by this layer. The thermosphere gets hotter and expands or "puffs up". Because of this, the height of the top of the thermosphere varies. The thermosphere has winds and tides that help move energy around. Why is this important for NASA engineers to know when designing future satellites? A) The thermosphere creates a drag force on the satellites as they orbit. B) The satellite will continue to travel through the thermosphere to the exosphere. When launched the high energy radiation from the sun will cause the satellite to burst. D) The winds and tides of the thermosphere will cause the satellite to move up and down instead of orbit. Submit

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

Madison pushes with a 210-n horizontal force on a 24-kg crate of coffee resting on a warehouse floor. the force of friction on the crate is 74 n. what is the acceleration?

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud