According to the following figure, as you increase in altitude in Earth's lower atmosphere, the atmospheric pressure ________ dramatically at a(n) _________ rate.

a. increases; increasing
b. increases; decreasing
c. decreases; decreasing
d. decreases; increasing
e. decreases; constant


c. decreases; decreasing

Physics & Space Science

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Newton found that gravity varied with the ________ of the distance between the two bodies pulling on each other

Fill in the blank(s) with correct word

Physics & Space Science

A large critical part is made of steel for which KIc=60 MPa·m1/2 determined in air at room temperature. Nondestructive inspection has found no cracks in the part.

The minimum detectable crack length for the nondestructive inspection equipment is 2a=0.20×10-3 m. The part is to be subject to a stress range of ??=300 MPa about a mean stress of 150 MPa. Laboratory tests in air at room temperature show that the crack growth rate in this material follows the relationship da/dN=1×10-13 ?K6 in units of MPa and meters. (a) Predict the crack length at fracture, assuming an internal crack with Y=1. (b) Calculate the lifetime of this part based upon fatigue-crack propagation in air at room temperature.

Physics & Space Science

You are in a boat filled with large rocks in the middle of a small pond. You begin to drop rocks into the water. What happens to the water level of the pond?

Physics & Space Science

The neap tides can only occur when the Moon's position is at or near one of its orbital nodes

Indicate whether the statement is true or false

Physics & Space Science