A particle (charge 7.5 ?C) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-?C charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?
a. 3.0 J
b. 1.8 J
c. 2.4 J
d. 1.2 J
e. 1.4 J
d
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Imagine two boats. One travels 5.0 m/s eastward relative to the earth and the other 3.4 m/s eastward relative to the earth. We set up a reference frame on each boat with the x axis pointing eastward, and choose the first boat (arbitrarily) to be the Home Frame. The second boat is thus the Other Frame. What is the sign of ?, according to the convention established in this chapter?
A. Positive B. Negative C. We are free to choose either sign.
An airplane flying horizontally at a speed of 50.0 m/s and an elevation of 160 m drops a package. Two seconds later it drops a second package. How far apart will the two packages land?
A. 100 m B. 162 m C. 183 m D. 269 m
Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?
A) Reflecting telescopes have their heaviest component (the mirror) at the bottom rather than the top of the telescope's tube. B) Reflecting telescopes take up less space than refracting telescopes. C) Reflecting telescopes are taller than refracting telescopes. D) For a mirror and lens of the same diameter, a mirror will collect more light.
Which of the following statements is TRUE?
A. Saturn has small- and medium-sized moons, but no large ones. B. Jupiter's solid surface lies just below the cloud layers visible from Earth. C. Neither Uranus or Neptune have ring systems. D. The Great Red Spot is an anti-cyclone on Jupiter E. There is no evidence to suggest that either Jupiter or Saturn has a rocky core.