In which wavelengths have the births of new stars been best mapped recently?
A) gamma rays
B) extreme ultraviolet
C) infrared
D) microwave
E) radio
C
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Multiple-Object Accelerating Systems: Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as shown in the figure. Which of the following statements about the tensions is correct? (There could be more than one correct choice.)
A. T1 = P B. T2 = P C. T1 + T2 = P D. T2 > T1 E. T1 > T2
An object moves 100 m along a frictionless table at a constant speed. The object weighs 50 N. The work done on the object by the gravitational force is
a. 0 J. b. 2 J. c. 50 J. d. 100 J. e. 5000 J.
In an electroplating process, it is desired to deposit 40.0 mg of silver on a metal part by using a current of 2.00 A
How long must the current be allowed to run to deposit this much silver? (The silver ions are singly charged, and the atomic weight of silver is 108.)
Single-Slit Diffraction: A beam of monochromatic light passes through a slit that is 11.0 ?m wide. If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31° away from the centerline, what is the wavelength of light?
A. 827 nm B. 301 nm C. 602 nm D. 402 nm E. 201 nm