A pair of observers moving relative to one another will always agree upon all but which of the following:
A. the length of a space-time interval between two events
B. their respective rest masses
C. whether two events are simultaneous
D. their relative velocity
E. the relativistic factor gamma that links their reference frames
C. whether two events are simultaneous
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Springs: A force of 30 N stretches a very light ideal spring 0.73 m from equilibrium. What is the force constant (spring constant) of the spring?
A. 41 N/m B. 22 N/m C. 34 N/m D. 46 N/m
This bar graph is based on statistical study of results from the Kepler mission. Which of the following conclusions is supported by the graph?
A) At least about 15% of stars have a planet similar in size to Earth. B) Most stars with an Earth-sized planet do not have any larger jovian planets orbiting far from their stars. C) Most stars have five planets. D) A star orbited by a super-Earth is likely also to be orbited by a mini-Neptune.
An electron is released from rest at the negative plate of a parallel plate capacitor. If the distance between the plates is 5 mm and the potential difference across the plates is 5 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10?31 kg, qe = 1.6 × 10?19 C.)
What will be an ideal response?
A person's face is 30 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
A) 20 cm B) 30 cm C) 50 cm D) 70 cm E) 90 cm