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Questions in physics

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

[Homework Help] Choose the correct alternatives (MCQs): 1. Which of the following formulae can give the value of the velocity ratio of the wheel and axle? A) [tex]$\frac{1}{1 V}$[/tex] B) [tex]$\frac{l}{h}$[/tex] C) [tex]$\frac{ R }{ r }$[/tex] D) [tex]$\frac{ T }{ R }$[/tex] 2. Which of the following is an example of a wheel and axle? A) staircase B) screwdriver C) scissors D) nut-cracker 3. Which ratio of the following is given by mechanical advantage? A) two forces B) two works C) two distances D) two loads 4. Which of the following is velocity ratio? A) [tex]$\frac{ L }{ E }$[/tex] B) [tex]$\frac{ Ld }{ Ed }$[/tex] C) [tex]$\frac{ Ed }{ Ld }$[/tex] D) [tex]$\frac{ E }{ L }$[/tex] 5. Which of the following is affected by friction? A) VR B) efficiency C) MA D) B and C both 6. Which of the following work is done by effort? A) input work B) output work C) resultant work D) useful work 7. Which of the following has 100% efficiency? A) hydraulic machine B) perfect machine C) simple machine D) compound machine 8. Velocity ratio of which machine is given by [tex]$\frac{l}{h}$[/tex]? A) lever B. inclined plane C) pulley D) wheel and axle

[Homework Help] Is a 10 gauge wire larger or smaller than a 12 gauge wire? A. Smaller B. Shorter C. Larger D. Longer

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

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

[Homework Help] Choose all options that apply. Which of the following are good electrical insulators? a) Ceramic b) Plastic c) Copper d) Steel e) Gold

[Homework Help] A frog leaps at [tex]$6.32 m / s$[/tex] at a [tex]$36.3^{\circ}$[/tex] angle to the horizon. What is the maximum height of the frog? [tex]$\Delta y=[?] m$[/tex]

[Homework Help] Which of the following is considered to be a vector? A) Time B) Mass C) Velocity D) Temperature

[Homework Help] Which change will always result in an increase in the gravitational force between two objects? A. increasing the masses of the objects and increasing the distance between the objects B. decreasing the masses of the objects and decreasing the distance between the objects C. increasing the masses of the objects and decreasing the distance between the objects D. decreasing the masses of the objects and increasing the distance between the objects

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