The time required for one-half of a radioactive material to decay is called the

A) absolute age.
B) half-life.
C) date age.
D) true-life.


Answer: B

Physics & Space Science

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When playing pool or billiards, the paths of the two balls after a collision are at approximately right angles to one another. This is due to:

A. The fact that momentum is conserved B. The fact that kinetic energy is conserved C. The fact that both momentum and kinetic energy are conserved

Physics & Space Science

A long nonconducting cylinder (radius = 12 cm) has a charge of uniform density (5.0 nC/m3) distributed throughout its column. Determine the magnitude of the electric field 5.0 cm from the axis of the cylinder

a. 25 N/C b. 20 N/C c. 14 N/C d. 31 N/C e. 34 N/C

Physics & Space Science

A tube bank consists of 30 columns of 3 cm diameter tubes, spaced 4.5 cm apart (center to center) in-line both ways. Ethylene glycol at 90ºC is to be cooled to 60ºC after passing over the tube bank at 2 m/s. Estimate the average tube temperature.

What will be an ideal response?

Physics & Space Science

The masses of stars are generally in the range of 30 to 0.1 solar masses.

Answer the following statement true (T) or false (F)

Physics & Space Science