If an electron is accelerated from rest through a potential difference of 300 V, find its approximate speed at the end of this process. (e = 1.6 × 10^-19 C; me = 9.1 × 10^-31 kg)

a. 2.5 × 10^7 m/s
c. 1.0 × 10^7 m/s
b. 2.1 × 10^7 m/s
d. 1.4 × 10^7 m/s


C

Physics & Space Science

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In a situation where an object can move only along the x axis, a book states “the force on the object is F = -kx, where k is a constant, and x is the object’s position coordinate.” Is F being used here as a shorthand symbol for (A) or Fx (C)?

A. A B. C

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A system of blocks and a frictionless pulley is shown in the figure. Block A has a mass of 2.0 kg and is on a rough horizontal surface for which ?s = 0.40 between the surface and block A

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a. 76 m/s c. 25 m/s b. 27 m/s d. 0.99 m/s

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Specific Heat: A glass beaker of unknown mass contains 74.0 ml of water. The system absorbs 2000.0 cal of heat and the temperature rises 20.0°C as a result. What is the mass of the beaker? The specific heat of glass is 0.18 cal/g ? °C, and that of water is 1.0 cal/g ? C°.

A. 140 g B. 560 g C. 540 g D. 270,000 g

Physics & Space Science