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Questions in physics

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 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]) a. The object is moving down for [tex]$t$[/tex] in the interval ______ but is never moving up. A. The object is moving down for [tex]$t$[/tex] in the interval ______ but is never moving up. B. The object is moving down for [tex]$t$[/tex] in the interval (3.25, 6.5) and the object is moving up for [tex]$t$[/tex] in the interval [0, 3.25). 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]$t = 3.25$[/tex] sec. 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. 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 (3.25, 6.5] and the object slows down for [tex]$t$[/tex] in the interval [0, 3.25). 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]$t =$[/tex] ______ when the speed is ______ ft/sec. The object is moving slowest at [tex]$t =$[/tex] ______ when the speed is ______ ft/sec B. The object is moving at a constant speed of ______ ft/sec.

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

📝 Answered - Which is the correct equation for calculating the kinetic energy of an object? [tex]KE=mgh[/tex] [tex]KE=\frac{1}{2}mv^2[/tex] [tex]KE=\frac{1}{2}at^2[/tex] [tex]KE=\frac{1}{4}g^2[/tex]

📝 Answered - Which of the following is viscoelastic in nature? Answer Options: Select one of four Mesosphere Stratosphere Lithosphere Asthenosphere

📝 Answered - Haley is trying to pull an object upward. The below forces are acting on the object. [tex] \begin{array}{l} F_p=5500 N \\ F_g=6000 N \end{array} [/tex] Which represents the net force? A. -500 N B. -500 N C. + 500 N D. 500 N

📝 Answered - Why do melting ice caps make Earth warmer? A. Ocean water cools off. B. More solar energy is reflected. C. Salinity of ocean water increases. D. Albedo decreases.