What Is a peristaltic rush?

The tabulated data show the concentration of AB versus time for this reaction: $\mathrm{AB}(g) \longrightarrow \mathrm{A}(g)+\mathrm{B}(g)$

$$\begin{matrix} \text{Time (s)} & \text{[AB] (M)}\\ \text{0} & \text{0.950}\\ \text{50} & \text{0.459}\\ \text{100} & \text{0.302}\\ \text{150} & \text{0.225}\\ \text{200} & \text{0.180}\\ \text{250} & \text{0.149}\\ \text{300} & \text{0.128}\\ \text{350} & \text{0.112}\\ \text{400} & \text{0.0994}\\ \text{450} & \text{0.0894}\\ \text{500} & \text{0.0812}\\ \end{matrix}$$

Determine the order of the reaction and the value of the rate constant. Predict the concentration of AB at 25 s.

People can better monitor their drinks by: A. Asking how much alcohol is in each drink B. Never leaving a drink unattended C. Pouring each drink themselves D. All of the above

A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. He then falls onto a thick pad. The top of the pad is 80 cm above the ground, and it compresses by 50 cm as he comes to rest. What is his acceleration as he comes to rest on the pad?

Small-plane pilots regularly compete in "message drop" competitors, dropping heavy weights (for which air resistance can be ignored) from their low-flying planes and scoring points for having the weights land close to a target. A plane 60 m above the ground is flying directly toward a target at 45 m/s. a. At what distance from the target should the pilot drop the weight? b. The pilot looks down at the weight after she drops it. Where is the plane located at the instant the weight hits the ground---not yet over the target, directly over the target, or past the target?

Suppose that f(x) = 0.25 for 0 < x < 4. Determine the mean and variance of X.