Pulsars were discovered because they _____
a. provide the energy to ionize supernova remnants
b. radiate gravitational waves
c. absorb matter from a binary companion through an accretion disk
d. emit short, regular bursts of radiation
e. undergo nova eruptions on a regular period of a few years
d
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An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2 . What is the magnitude of the force the object exerts on the floor of the elevator?
a. 59 N b. 10 N c. 89 N d. 68 N e. 78 N
A proton and an alpha particle are moving perpendicular to a uniform magnetic field with the same speed. If the velocity of the proton is at an angle of 20° with respect to the magnetic field direction, at what angle to the magnetic field direction would the alpha particle be moving if it experiences the same magnitude acceleration as the proton? The alpha particle has 4 times the mass of the
proton and twice its charge. a. 43° c. 62° b. 10° d. 9.8°
Standing Sound Waves: A pipe that is 0.92 m long and open at both ends vibrates in the second overtone with a frequency of 584 Hz. What is the speed of sound in the air in this pipe?
A. 358 m/s B. 349 m/s C. 353 m/s D. 344 m/s E. 363 m/s
A drawing is placed 40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?
A) -45 cm B) 75 cm C) 90 cm D) 200 cm