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Questions in physics

[Jawaban] 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

[Jawaban] Two forces A) Which of the following is velocity ratio? B) [tex]\frac{ Ld }{ Ed }[/tex] (C) [tex]\frac{ Ed }{ Ld }[/tex] D) [tex]\frac{E}{L}[/tex] A) [tex]\frac{L}{E}[/tex] Which of the following is affected by friction? A) VR B) efficiency C) MA D) B and C both Which of the following work is done by effort? A) input work B) output work C) resultant work D) useful work Which of the following has 100% efficiency? A) hydraulic machine B) perfect machine C) simple machine D) compound machine Velocity ratio of which machine is given by [tex]\frac{-}{h}[/tex]? A) lever B) inclined plane D) wheel and axle

[Jawaban] What happens to an object's inertia if its mass increases? A. It becomes zero. B. It decreases. C. It increases. D. It remains the same.

[Jawaban] A book that has a mass of 0.5 kilograms is pushed across a table with a force of 20 newtons. What's the acceleration of the book? A) $4 m / s ^2$ B) $40 m / s ^2$ C) $0.025 m / s ^2$ D) $10 m / s ^2$

[Jawaban] True or False. A static charge is a permanent charge.

[Jawaban] John pushes his brother Danny on a skateboard. John applies a force of 2 N and Danny's acceleration is [tex]$0.9 m / s ^2$[/tex]. What is the combined mass of Danny and his skateboard? A. 31 kg B. 48 kg C. 43 kg D. 35 kg

[Jawaban] A softball player hits a ball at 29.5 m/s at a $33.0^{\circ}$ angle to the horizon. An outfielder catches the ball at the same height. How far was the outfielder from the hitter? $\Delta x=[?] m$

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

[Jawaban] What is the difference between Earth and Moon?

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