Physics is my favourite subject and i love teaching it .
A constant force of magnitude $25 \mathrm{N}$ acts on an object for 3.0 s. What is the magnitude of the impulse?
For the cue ball in Figure $Q$ 7.12. make a qualitative sketch of how the force exerted by the rail on the ball varies with time. Be sure to plot both the $x$ and $y$ components of the force and indicate when the ball is in contact with the rail.
What is the de impedance of the electrode, assuming that it behaves as an ideal capacitor?A. 0B. InfiniteC. $\sqrt{2} \times 10^{4} \Omega$D. $\sqrt{2} \times 10^{6} \Omega$
Consider a $2100-\mathrm{kg}$ car cruising at constant speed of $70 \mathrm{~km} / \mathrm{h}$. Now the car starts to pass another car by accelerating to $110 \mathrm{~km} / \mathrm{h}$ in $5 \mathrm{~s}$. Determine the additional power needed to achieve this acceleration. What would your answer be if the total mass of the car were only $700 \mathrm{~kg}$ ?
Calculate the total work, in $\mathrm{kJ},$ for process $1-3$ shown in Fig. P4-4 when the system consists of $2 \mathrm{~kg}$ of nitrogen.
