The number of reliably known digits in a number is called the number of estimated uncertainty
Indicate whether the statement is true or false
FALSE
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Which of the following best represents the energy transformations occurring in a coal-fired power plant?
A) thermal ? chemical ? electric B) gravitational ? thermal ? electric C) chemical ? electric ? thermal D) chemical ? thermal ? electric E) electric ? thermal ? chemical
Life forms in the Precambrian include
A) trilobites, brachiopods and stromatolites. B) cyanobacteria and trilobites. C) the agnatha and the coelacanths. D) stromatolites and certain primitive blue-green algae.
A rocket of total mass M and with burnout mass 0.20M attains a speed of 3 400 m/s after starting from rest in deep space. What is the exhaust velocity of the rocket?
a. 6.8E+2 m/s b. 2.1E+3 m/s c. 1.7E+4 m/s d. 2.2E+3 m/s e. 1.1E+3 m/s
A ray of light is incident on a pane of common window glass at an angle of 35° to the normal. The angle of the reflected ray with respect to the normal is
1) 35° 2) 55° 3) 90° 4) 20° and the refracted ray within the glass may be at an angle of 5) 35°. 6) 55°. 7) 22°. 8) 75°.