Identical waves superimposed out of phase produce a wave of decreased
A) amplitude.
B) frequency.
C) wavelength.
D) all of the above
E) none of the above
Answer: A
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Chris and Jamie are carrying Wayne on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 100 N. Wayne weighs 800 N. Wayne's center of gravity is 75.0 cm from Chris. Chris and Jamie are at the ends of the stretcher. The force that Chris is exerting to support the stretcher, with Wayne on it, is
A. 250 N. B. 350 N. C. 400 N. D. 550 N. E. 650 N.
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Indicate whether the statement is true or false
An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away. (One light-year is the distance light travels in one year.)
According to the astronaut, how long does the trip take? A) 14.4 y B) 22.7 y C) 9.34 y D) 15.0 y E) 4.20 y
A beam of electrons is accelerated through a potential difference of 10 kV before entering a region having uniform electric and magnetic fields that are perpendicular to each other and perpendicular to the direction in which the electron is moving
If the magnetic field in this region has a value of 0.010 T, what magnitude of the electric field is required if the particles are to be undeflected as they pass through the region? A) 2.3 × 103 V/m B) 7.9 × 103 V/m C) 5.9 × 105 V/m D) 6.0 × 105 V/m E) 7.2 × 106 V/m