The astrometric technique looks for planets with careful measurements of a star's
A) brightness.
B) velocity towards or away from us.
C) position in the sky.
D) all of the above
C
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The mer of polyethylene is made from two atoms of ______________and two atoms of hydrogen.
Fill in the blank(s) with the appropriate word(s).
General Questions: A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
A. 75 N. B. 7.5 N. C. 750 N. D. any horizontal force greater than zero.
An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 4.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 1000
A. 1.50 cm B. 1.36 cm C. 1.28 cm D. 1.12 cm E. 1.00 cm
A conducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and connected by a wire at one end
The resistance of the bar and the rails is constant and equal to 0.10 ?. A uniform magnetic field is perpendicular to the plane of the rails. A 0.080-N force parallel to the rails is required to keep the bar moving at a constant speed of 0.50 m/s. What is the magnitude of the magnetic field? A) 0.10 T B) 0.25 T C) 0.36 T D) 0.54 T E) 0.93 T