A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
A. 316 Hz
B. 632 Hz
C. 158 Hz
D. 215 Hz
E. 79 Hz
Answer: C
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Matter Waves: Protons are being accelerated in a particle accelerator. When the energy of the protons is doubled, their de Broglie wavelength will
A. increase by a factor of 4.
B. increase by a factor of 2.
C. decrease by a factor of 2.
D. increase by a factor of 
.
E. decrease by a factor of 
.
Your weight is the force
A) due to gravity only. B) you exert against a supporting surface. C) equal to your normal force on any surface.
What is the goal of comparative planetology?
A) to use planetary positions to foretell the future B) to find which planets will be most suitable for future colonization C) to help plan future visits by unmanned probes, orbiters, and rovers D) to determine the origin and evolution of the solar system E) to find out how our own solar system compares with extrasolar ones
Two students are working on the same constant-acceleration problem involving a car undergoing constant acceleration, having started from rest and after a certain time having traveled a distance of 108 m. The students are to find the average velocity. Both students are required to show their work and round any intermediate answers as well as the final answer properly to 3 significant figures. Each
rounded answer is to be used in the next step of calculation as they proceed. For the final answer, Student A uses the formula vavg = (xf – xi)/(tf – ti) getting the result 7.26 m/s, and Student B uses the formula vavg = (v0 + v)/2 getting the result 7.29 m/s. Assuming neither student makes a mistake, which student has the better answer? a. Student A b. Student B c. Under significant figure rounding, both answers are equally as good. d. The described result cannot happen; this is physics after all.