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Questions in physics

📝 Answered - 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

📝 Answered - 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.

📝 Answered - 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) $10 m / s ^2$

📝 Answered - True or False. A static charge is a permanent charge.

📝 Answered - 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

📝 Answered - 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? $\Delta x=[?] m$

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

📝 Answered - What is the difference between Earth and Moon?

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

📝 Answered - An egg initially at rest is dropped from the roof of a 31.5 m tall building and travels in free fall. What is the final velocity of the egg just before it hits the ground? [tex]v_{f}=[?] m / s[/tex] Do not account for air resistance. Remember, downward velocity is a negative vector (-).