Electrons are accelerated through a potential difference of 90.0 kV and directed at a tungsten target to produce x-rays. What is the shortest wavelength of the x-rays produced?
A. 669 pm
B. 508 pm
C. 72.6 pm
D. 13.8 pm
E. 14.3 pm
D. 13.8 pm
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An airplane is traveling 835 km h in a direction 41.5 degree west of north.
(a) Find the components of the velocity vector in the northerly and westerly directions.
(b) How far north and how far west has the plane traveled after 2.50 h?
A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point
If a small plane mirror is placed at the center of curvature with its reflecting side facing the focal point, where is the final image? A) 3 cm in front of the mirror B) 40 cm in front of the mirror C) 50 cm in front of the mirror D) 60 cm in front of the mirror E) 70 cm in front of the mirror
A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): Range = 0.20 km; angle of launch = ?/4; landing height = launch height
What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s B) 1.4 m/s C) 22 m/s D) 0.69 m/s
A capture by a target nucleus of uranium-235 is most apt to occur for which type of "bullet" particle?
a. low velocity alpha particle b. low velocity proton c. high velocity neutron d. low velocity neutron