Bob is in a spaceship going by you at 90% of the speed of light, but in an upright standing position. Bob measures his mass to be 50 kg, his height to be 2.0 meters, and his waist size to be 80 cm. What would you say about his measurements?
A) His mass is more than 50 kg, his height is still 2.0 meters, and his waist size is less than 80 cm.
B) His mass is more than 50 kg, his height is less than 2.0 meters, and his waist size is less than 80 cm.
C) His mass is less than 50 kg, his height is more 2.0 meters, and his waist size is less than 80 cm.
D) You would measure the same mass and size as he does.
A
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A solenoid 4.0 cm in radius and 4.0 m in length has 8000 uniformly spaced turns and carries a current of 5.0 A. Consider a plane circular surface (radius = 2.0 cm) located at the center of the solenoid with its axis coincident with the axis of the solenoid. What is the magnetic flux through this surface? (1 Wb = 1 T ? m2)
A. 63 ?Wb B. 16 ?Wb C. 0.25 mWb D. 10 ?Wb E. 5.0 ?Wb
Most mutations make no difference, but some mutations are fatal, killing the afflicted organisms before they can reproduce
Indicate whether the statement is true or false
Uncertainty Principle Using Momentum and Position: An electron inside a hydrogen atom is confined to within a space of about 0.12 nm. What is the uncertainty in this electron's speed? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 3.1 × 105 m/s B. 4.8 m/s C. 3.1 km/s D. 9.6 × 105 m/s E. 4.8 × 106 m/s
How many arc seconds are in a degree?
A) 60 B) 3600 C) 600 D) 86400 E) None; seconds measure time and degrees measure temperature.