A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2 . For the next 20 s, the acceleration of the particle is ?1.0 cm/s2 . What is the position of the particle at the end of this motion?

a. zero
b. +3.0 m
c. ?1.0 m
d. +2.0 m
e. ?3.0 m


b

Physics & Space Science

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Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?

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One similarity between electrons and photons is

A) both are the quanta of a field. B) both are particles of matter. C) Both of the above. D) both are forms of radiation. E) None of the above.

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A magnifying glass uses a convex lens with a refractive power of 20 diopters. What is the angular magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?

A) 5.0 B) 3.0 C) 4.0 D) 1.0 E) 2.0

Physics & Space Science

A hoop is rolling without slipping along a horizontal surface with a forward speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal

What is the speed of the hoop after it has rolled 3.00 m up as measured along the surface of the ramp? A) 4.22 m/s B) 1.91 m/s C) 2.06 m/s D) 3.79 m/s E) 8.02 m/s

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