Which of the following aluminum alloys is not recommended for welding?

(a) 3003
(b) 5052
(c) 6061
(d) 7075


(d) 7075

Physics & Space Science

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Stellar paralax proves that Earth is

a. rotating. b. revolving. c. precessing. d. an oblate spheroid.

Physics & Space Science

Which of the following is not true about potential energy?

a. Potential energy is stored energy. b. Potential energy is related to position. c. Potential energy is a scalar quantity. d. Potential energy has direction.

Physics & Space Science

A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 190 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 55°. How high is the fountain?

a. 25 m b. 53 m c. 86 m d. 43 m e. 48 m

Physics & Space Science

A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10^?6 m, how many photons are in each pulse?

a. 2 × 10^25 b. 2 × 10^21 c. 3 × 10^18 d. 6 × 10^38 e. 2 × 10^18

Physics & Space Science