Physics, 24.10.2019 20:43, ababot8339
The scale height of an atmosphere is a measure of how tightly a planet holds onto its atmospheric gases. this is a very useful concept because it balances the atmosphere's thermal energy of expansion against gravity's compression. as a rule of thumb, planets with larger scale heights struggle more to hold onto their atmospheres than planets with smaller scale heights. the scale height of an atmosphere can be computed as h = kt/g where k is a measure of the energy density of the atmosphere (which depends upon the average molecular mass of the atmosphere) expressed in units of j/kg k, t is the planet's surface temperature in units of k, and g is the gravitational acceleration at the planet's surface in units of m/s2. (note that when the calculation is performed in these units, the resultant scale height is measured in meters. often, we find it more convenient to convert the scale height into units of kilometers.) venus has an energy density k = 191.7 j/kg k, a surface temperature t = 750 k and a surface gravitational acceleration g = 8.87 m/s2. what is the scale height of venus in units of kilometers?
Answers: 3
Physics, 22.06.2019 09:30, officialariana01
In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final
Answers: 3
Physics, 22.06.2019 09:50, ggcampos
Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c. the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors
Answers: 1
Physics, 22.06.2019 12:20, drewefielder6198
Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.
Answers: 2
Physics, 22.06.2019 15:30, sandra5456
An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?
Answers: 1
The scale height of an atmosphere is a measure of how tightly a planet holds onto its atmospheric ga...
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