The Phoenix lander on Mars failed to confirm the presence of water ice under the surface
Indicate whether the statement is true or false
FALSE
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The mass density of pure water is 
If the molecular mass of water is 18.0 u, how many water molecules are in spherical water balloon of radius 1.0 cm?
a. 
b. 
c. 
d. 
The magnitude of the drag force of air resistance on a certain 20.0-kg object is proportional to its speed. If the object has a terminal speed 80.0 m/s, what is the magnitude of the drag force on the object when it is falling with a speed 30.0 m/s?
A) 196 N B) 7.50 N C) 15.0 N D) 73.5 N E) 42.7 N
Jack rides a bicycle northward at 12 mph. Jill rides southward on the same road at 12 mph. As they pass each other
A) their speeds are identical and their velocities are identical. B) their speeds are identical but their velocities are different. C) their speeds are different but their velocities are identical. D) their speeds are different and their velocities are different. E) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision
a. 15 m/s b. 7.0 m/s c. 8.0 m/s d. 23 m/s e. 11 m/s