In the year 2000, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A) 280
B) 28
C) 2800
D) 2.8
E) 0.28
A
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In a double slit experiment, a beam of electrons strikes a pair of slits
The slits are 15 ?m apart, and the first interference maximum lies at an angle of 0.50 µrad from the center of the interference pattern. What is the momentum of the incoming electrons? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 8.8 × 10-23 kg ? m/s B) 1.1 × 10-23 kg ? m/s C) 2.2 × 10-23 kg ? m/s D) 4.4 × 10-23 kg ? m/s E) 6.6 × 10-23 kg ? m/s
A long horizontal wooden beam supported at its ends sags when you sit in the middle. Due to bending, the top part of the beam is under
1) tension. 2) compression. And the bottom of the beam is under 3) tension. 4) compression. And the part of a beam where no tension or compression occurs 5) along the center of the beam. 6) along the neutral layer. 7) both of these 8) none of these
Newton's Second Law in 1 Dimension: The figure shows an acceleration-versus-force graph for three objects pulled by wires. If the mass of object 2 is 36 kg, what are the masses of objects 1 and 3?
A. 12 kg and 90 kg B. 72 kg and 18 kg C. 90 kg and 12 kg D. 12 kg and 72 kg
What is the name for the following polyatomic ion?
PO4-3 A) phosphate B) phosphorus oxide C) phosphinate D) trioxo phosphoride E) potassium