If protons are accelerated from rest in a Van de Graff accelerator through a potential difference of 1.00 MV, what is their resulting speed?
a. 
b. 
c. 
d. 
e. 
d.
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A 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in length of the rod? Young's modulus for steel is 20 × 1010 N/m2
A) 5.6 × 10-5 m B) 6.5 × 10-5 m C) 5.6 × 10-6 m D) 6.5 × 10-6 m E) 6.5 × 10-4 m
Assume that a uniform magnetic field is directed into this page. If a proton is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the proton?
a. into the page c. to the right b. to the left d. out of the page
An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
a. 1 b. 2 c. 1/2 d. 1/4 e. -2
After seeing a flash of lightning, if one counts the seconds before hearing the thunder, one can estimate the distance to the flash. How many seconds delay
(a) per mile? (b) per kilometer?