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Questions in physics

📝 Answered - Under which condition is no work done? A. A force pushes an object and slows it down. B. A force pulls an object and speeds it up. C. A force pulls down on an object that moves downward. D. A force pushes up on an object that stays in place.

📝 Answered - What is the reference for a peer-reviewed article on 'Does the dopamine hypothesis explain schizophrenia?' Chi-Ieong Lau, Han-Cheng Wang, Jung-Lung Hsu, Mu-En Liu PMID: 23843581 DOI: 10.1515/revneuro-2013-0011 Abstract: The dopamine hypothesis has been the cornerstone in the research and clinical practice of schizophrenia. With the initial emphasis on the role of excessive dopamine, the hypothesis has evolved to a concept of combining prefrontal hypodopaminergia and striatal hyperdopaminergia, and subsequently to the present aberrant salience hypothesis. This article provides a brief overview of the development and evidence of the dopamine hypothesis. It will argue that the current model of aberrant salience explains psychosis in schizophrenia and provides a plausible linkage between the pharmacological and cognitive aspects of the disease. Despite the privileged role of dopamine hypothesis in psychosis, its pathophysiological rather than etiological basis, its limitations in defining symptoms other than psychosis, as well as the evidence of other neurotransmitters such as glutamate and adenosine, prompt us to a wider perspective of the disease. Finally, dopamine does explain the pathophysiology of schizophrenia, but not necessarily the cause per se. Rather, dopamine acts as the common final pathway of a wide variety of predisposing factors, either environmental, genetic, or both, that lead to the disease. Other neurotransmitters, such as glutamate and adenosine, may also collaborate with dopamine to give rise to the entire picture of schizophrenia.

📝 Answered - Which of the following is not a type of galaxy? A. Elliptical B. Round C. Lens D. Spiral

📝 Answered - How many hertz are in 96 megahertz? Express the answer in correct scientific notation. [tex]$96 MHz=[?] \times 10^{[?]} Hz$[/tex] Enter the coefficient in the green box and the exponent in the yellow box.

📝 Answered - An orange light has a wavelength of 630 nm. What is the wavelength in meters? Give your answer in proper scientific notation. [?] \times 10^{[?]} m Enter the coefficient in the green box and the exponent in the yellow box.

📝 Answered - Describe an experiment to demonstrate terminal velocity. Say what measurements you need to take in your experiment to show that a falling object has reached terminal speed.

📝 Answered - Select the correct answer. A force of 5.25 newtons acts on an object of a mass 25.5 kilograms. How far is the object from the center of Earth? (The value of G is [tex]$6.673 \times 10^{-11}$[/tex] newton meter [tex]$^2 /$[/tex] kilogram [tex]$^2$[/tex]. The mass of Earth is [tex]$5.98 \times 10^{24}$[/tex] kilograms.) A. [tex]$2.1 \times 10^7$[/tex] meters B. [tex]$4.4 \times 10^7$[/tex] meters C. [tex]$5.8 \times 10^7$[/tex] meters D. [tex]$6.9 \times 10^7$[/tex] meters

📝 Answered - What is the frequency of an orange light with a wavelength of [tex]$6.3 \times 10^{-7} m$[/tex]? Give your answer in proper scientific notation. [tex] \begin{array}{c} {[?] \times 10^{[?]} Hz} \\ c=3.0 \times 10^8 m / s \end{array} [/tex] Enter the coefficient in the green box and the exponent in the yellow box.

📝 Answered - A wave with a period of [tex]$1 / 3$[/tex] second has a frequency of A) 3 Hz . B) 300 Hz . C) 33 Hz . D) 67 Hz .

📝 Answered - What is the energy of a purple lamp with a frequency of [tex]7.5 \times 10^{14} Hz[/tex]? [tex]h=6.626 \times 10^{-34} J \cdot s[/tex] [?] x 10^[?] J