The first small solid grains or flakes formed in our solar system by the process of ____, the addition of material to an object an atom or molecule at a time
a. Accretion
b. Sublimation
c. Hydration
d. Condensation
e. Vaporization
D
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The atmosphere you breathe today is Earth's primary atmosphere
Indicate whether the statement is true or false
Velocity: An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?
A. 260 mi/h B. 270 mi/h C. 275 mi/h D. 280 mi/h
A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket.
A. 0.40 kg/s B. 0.50 kg/s C. 0.60 kg/s D. 0.70 kg/s E. 0.80 kg/s
A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 8 seconds. The average acceleration of the car while on the hill is
A. 2.5 m/s2. B. -2.5 m/s2. C. 10 m/s2. D. 0 m/s2. E. -10 m/s2.