A 2.0-kg object is moving without friction along the x-axis. The potential energy curve as a function of position is shown in the figure, and the system is conservative
If the speed of the object at the origin is 4.0 m/s, what will be its speed at 7.0 m along the +x-axis?
A) 4.0 m/s
B) 4.2 m/s
C) 4.4 m/s
D) 4.6 m/s
E) 9.8 m/s
Answer: B
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Acceleration: Suppose that an object is moving with a constant velocity. Which statement concerning its acceleration must be correct?
A. The acceleration is constantly increasing. B. The acceleration is constantly decreasing. C. The acceleration is a constant non-zero value. D. The acceleration is equal to zero.
Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiative energy
A) a source of high-energy electrons for synchrotron radiation B) globular clusters for food C) a very strong magnetic field from neutron stars D) a high rate of rotation for the black hole E) an accretion disk of infalling matter
One gram of water is heated from 0°C to 100°C at a constant pressure of 1 atm. Determine the approximate change in internal energy (in cal) of the water
a. 160 b. 130 c. 100 d. 180 e. 50
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What will be an ideal response?