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Questions in physics

📝 Answered - Select the correct answer. In which section of the ASVAB test will Mary find the following question? The formula used to calculate electrical power is P=1x V. What does the letter V represent in this formula? A. Arithmetic Reasoning B. Word Knowledge C. Mathematics Knowledge D. Electronics Information E. Mechanical Comprehension

📝 Answered - True root-mean square (RMS) meters have sensitive electronic circuits that can accurately measure which of the following characteristics? a) Resistance b) Frequency c) Voltage d) Amperage e) Power

📝 Answered - Polly is pushing a box to the right across the floor with a force of 30 N. The force of gravity is 8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box? $\leftarrow 30 N$ $\leftarrow 8 N$ $\rightarrow 8 N$ $\rightarrow 30 N$

📝 Answered - The function [tex]$s=f(t)$[/tex] gives the position of an object moving along the [tex]$s$[/tex]-axis as a function of time [tex]$t$[/tex]. Graph [tex]$f$[/tex] together with the velocity function [tex]$v(t)=\frac{d s}{d t}=f^{\prime}(t)$[/tex] and the acceleration function [tex]$a(t)=\frac{d^2 s}{d t^2}=t^{\prime \prime}(t)$[/tex], then complete parts (a) through (f). [tex]$S=104 t-16 t^2, 0 \leq t \leq 6.5$[/tex] (a heavy object fired straight up from Earth's surface at [tex]$104 f / sec$[/tex]) B. The object is moving down for [tex]$t$[/tex] in the interval ([tex]$3.25,6.5$[/tex]] and the object is moving up for [tex]$t$[/tex] in the interval [[tex]$0,3.25$[/tex]). C. The object is never moving down, but is moving up for [tex]$t$[/tex] in the interval ______ D. The object is never moving down or up. c. When does the object change direction? Select the correct answer below, and if necessary, fill in the answer box to complete your choice. A. The object changes direction at [tex]$t=3.25 sec$[/tex]. (Type an integer or a decimal. Use a comma to separate answers as needed.) B. The object never changes direction. d. When does the object speed up and slow down? Select the correct answer below, and if necessary, fill in the answer box(es) to complete your choice. (Simplify your answer. Type your answer in interval notation. Use integers or decimals for any numbers in the expression.) A. The object never speeds up, but slows down for [tex]$t$[/tex] in the interval ______. B. The object speeds up for [tex]$t$[/tex] in the interval ([tex]$3.25,6.5$[/tex]] and the object slows down for [tex]$t$[/tex] in the interval [[tex]$0,3.25$[/tex]). C. The object speeds up for [tex]$t$[/tex] in the Interval ______ but never slows down. D. The object never speeds up or slows down. e. When is the object moving fastest (highest speed)? Slowest? Select the correct answer below and fill in any answer boxes to complete your choice. A. The object is moving fastest at [tex]$t=0,6.5$[/tex], when the speed is [tex]$104 f / sec$[/tex]. The object is moving slowest at [tex]$t=3.25$[/tex], when the speed is [tex]$0 ft / sec$[/tex]. (Type an integer or a decimal. Use a comma to separate answers as needed.) B. The object is moving at a constant speed of ______ f I/sec. f. When is the object farthest from the axis origin? When [tex]$t =$[/tex] ______ sec, the object is ______ feet from the origin, which is the farthest away.

📝 Answered - The information in the table represents the effect of the mass of two objects on the gravitational force between the two objects. | Mass of Object 1 (kg) | Mass of Object 2 (kg) | Distance between Objects 1 and 2 (m) | Gravitational Force between Objects 1 and 2 (N) | |---|---|---|---| | 1 | 1 | 1 | 4 | | 2 | 1 | 1 | ? | Which number should be in the cell with the question mark? A. The number is two because when you double the mass of one of the objects, the force between the objects is halved. B. The number is four because when you double the mass of one of the objects, the force between the objects remains the same. C. The number is eight because when you double the mass of one of the objects, the force between the objects also doubles. D. The number is sixteen because when you double the mass of one of the objects, the force between the objects

📝 Answered - Which procedure could a student use to examine an intensive property of a rectangular block of wood? A. Find the mass. B. Record the length. C. Measure the volume. D. Determine the density.

📝 Answered - What type of power plant burns material to make electricity? A. Radiant B. Geothermal C. Wind D. Coal

📝 Answered - Select the correct answer. Which quantity is a graduated cylinder designed for measuring? A. length B. mass C. temperature D. time E. volume

📝 Answered - A construction worker dropped a hammer while working on a skyscraper, 2643 feet above the ground. Use the formula [tex]$t=\frac{\sqrt{h}}{4}$[/tex] to find how many seconds it took for the hammer to reach the ground. Round to the nearest tenth of a second.

📝 Answered - Select the correct answer. Fred points a toy laser gun at a wall. Considering that the frequency of the gun's light is [tex]$4.91 \times 10^{14}$[/tex] hertz and that Planck's constant is [tex]$6.61 \times 10^{-34}$[/tex] joule seconds, what is the energy of the laser light? A. [tex]$3.24 \times 10^{-19}$[/tex] joules B. [tex]$4.91 \times 10^{15}$[/tex] joules C. [tex]$2.04 \times 10^{-21}$[/tex] joules D. [tex]$4.92 \times 10^{-18}$[/tex] joules