Mass on a Spring: A 3.7-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 450 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. The maximum elastic potential energy of the system is closest to
A. 1.4 J.
B. 1.3 J.
C. 1.6 J.
D. 1.7 J.
E. 1.8 J.
Answer: A
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Potential Energy: A very small 4.8-g particle carrying a charge of +9.9 ?C is fired with an initial speed of 8.0 m/s directly toward a second small 7.8-g particle carrying a charge of + 5.2 ?C. The second particle is held fixed throughout this process. If these particles are initially very far apart, what is the closest they get to each other? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
Fill in the blank(s) with the appropriate word(s).
Various observations suggest there may be recent or even continuing volcanic activity on Venus. Which of the following has NOT been observed?
A) bursts of radio energy, similar to those produced by lightning discharges occurring in the plumes of erupting volcanoes on Earth B) spacecraft detection over a period of days of flowing lava on Venus C) fluctuations in the level of sulfur dioxide in the planet's atmosphere D) surface features resembling rift valleys on Earth E) larger shield volcanoes than Hawaii
The jovian planets:
A) all lie less than 5 AU from the Sun. B) all have rings around their equators. C) all spin slower than the Earth. D) have satellite systems with less than 4 moons. E) are all much more dense than any of the terrestrials planets.
A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?
A) The heavy object, because it has greater kinetic energy. B) The light object, because it has smaller kinetic energy. C) The lightweight object, because it weighs less. D) The heavy object, because it weighs more. E) They both slide to the same height.