Why were the Russian Venera spacecraft so important to our understanding of Venus?
What will be an ideal response?
They were the first spacecraft to soft land on the planet and send images of the surface back to Earth.
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First Law of Thermodynamics: An expansion process on an ideal diatomic ideal gas for which CV = 5/2 R has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.030 m3, and the temperature is 390 K. The final pressure is 150 kPa and the final temperature is 340 K. What is the change in the internal (thermal) energy of the gas, during this process? (R = 8.31 J/mol ? K)
A. -2900 J B. -1700 J C. 2900 J D. 1700 J E. 0 J
Suppose a baseball travels 425 ft (130 m) from where the batter hits it to where it lands in the stands. The ball’s velocity makes an angle of 40° with respect to the horizontal as the ball leaves the bat. Suppose we first calculate the ball’s initial speed ignoring drag and find it to be . Including drag might plausibly require a higher initial speed for the ball to travel the same horizontal distance. On the other hand, by slowing down the ball’s vertical motion, including drag will increase the ball’s flight time, allowing the ball the same distance with a slower horizontal velocity. So if we include drag, for the ball to fly the same horizontal distance will we need
A. An initial speed greater than 
.
B. An initial speed less than .
C. An initial speed equal to .
D. More information to answer for sure.
When a wave is ______________, the angle of reflection equals the angle of incidence
Fill in the blank(s) with correct word
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion The displacement vector from the equilibrium position has its largest magnitude
Indicate whether the statement is true or false