According to Einstein, events that are simultaneous in one frame of reference
A) are simultaneous in all frames of reference.
B) are not simultaneous in other frames of reference.
C) may or may not be simultaneous in other frames of reference.
Answer: C
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Which one of the following processes of heat transfer requires the presence of a fluid?
a. conduction b. radiation c. convection d. none of the above choices are valid
The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to summer?
A) 1.2 cm B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0 cm
A car travels along east and its velocity decreases. The acceleration of the car is in which of the following directions?
A) Eastward B) Westward C) Northward D) Southward E) Cannot be determined without additional information.
A certain nucleus containing 8 protons and 7 neutrons has a density ?. Which of the following values would be closest to the expected value of the density of a nucleus having 51 protons and 69 neutrons?
A) 1.00 ? B) 1.85 ? C) 2.00 ? D) 2.14 ? E) 8.00 ?