7.
which scientist stated that all cells come from other cells?
hooke
schleiden
schwann
virchow
8.
a substance that cannot be broken down into simpler parts is called
an element
a compound
a carbohydrate
a particle
9.
which describes a light microscope with multiple lenses?
complex
compound
simple
regular

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.