A bullet is fired horizontally at a target 20 m away. The velocity of the bullet as it leaves the gun is 200 m/s. How much, approximately, will the bullet drop on its way to the target?
A. 0.4 m
B. 0.3 m
C. 0.2 m
D. 0.05 m
E. 0.1 m
Answer: D
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The mechanical equivalent of heat was first determined by
A) Lord Kelvin. B) James Joule. C) Stefan and Boltzmann. D) Count Rumford. E) Con Edison.
High frequency alternating current is passed through a solenoid that contains a solid copper core insulated from the coils of the solenoid. Which statement is correct?
A. A copper core remains cool no matter what the frequency of the current in the solenoid is. B. The copper core remains cool because the induced emf is parallel to the solenoid axis and fluctuates rapidly. C. The copper core heats up because an emf parallel to the solenoid axis is induced in the core. D. The copper core heats up because circular currents around its axis are induced in the core. E. The copper core heats up because the electric field induced in the copper is parallel to the magnetic field produced by the solenoid.
The blue tint of a coated camera lens is largely caused by what effects?
a. diffraction b. refraction c. polarization d. interference
If the energy of n = 6 is –0.378 eV and that of n = 4 is –0.850 eV in a hydrogen atom, a transition from n = 6 to n = 4 will emit a photon of what energy?