A bullet of mass 0.010 kg and speed of 500 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. The work done on the bullet by the block is
A. 1250 J.
B. 2.5 J.
C. zero.
D. -1250 J.
E. -2.5 J.
Answer: D
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The attractive force a 70 kg person exerts on Earth is much, much smaller than the force Earth exerts on the person.
a. true b. false
The Cassini mission to Saturn consists of
A) an orbiter that orbits Saturn and a probe that descended to the surface of Titan. B) a large spacecraft that flew by Saturn on its way to other planets. C) an orbiter that orbits Saturn and a probe that descended into Saturn's atmosphere. D) a spacecraft that orbits Saturn and a sample return mission that landed on Titan, scooped up a surface sample, and will return it to Earth.
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 12 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the same direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 1.1 mT b. 1.4 mT c. 1.7 mT d. 2.0 mT e. 0.2 mT
Photon Energy: What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
Fill in the blank(s) with the appropriate word(s).