Why are significant figures important in physics? A. Measuring devices aren’t always 100% accurate
B. To account for the high degree of accuracy in humans
C. They help reduce or eliminate the need for accuracy in humans
D. All of the above

Not C!

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

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.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?