QUESTIONS AND ANSWERS

Question A cyclist increases her speed uniformly from 5 m/s to 15 m/s in 20 seconds. Calculate her acceleration and the distance traveled in this… Read More »A cyclist increases her speed uniformly from 5 m/s to 15 m/s in 20 seconds

Question A car traveling with a uniform velocity of 20 m/s is subjected to a uniform retardation of 2 m/s². How long will it take… Read More »A car traveling with a uniform velocity of 20 m/s is subjected to a uniform retardation of 2 m/s²

Question A particle starts from rest and accelerates uniformly at 2 m/s² for 10 seconds. Calculate the distance covered and the final velocity attained. A… Read More »A particle starts from rest and accelerates uniformly at 2 m/s² for 10 seconds

Question A driver is moving at a constant speed of 115 kilometres per hour when he receives a text message on his mobile phone. We… Read More »A driver traveling at a speed of 115 km/hr received a text message on his mobile phone.

Question: A student walks a distance of 3 km in 20 minutes. Calculate his average speed. Quick Answer Average speed = Distance/Time = 3km /… Read More »A student walks a distance of 3 km in 20 minutes. Calculate his average speed

Question In fig 23.43, AB represents a uniform beam of weight 150 N which rests with the end B on a rough plane inclined at… Read More »In fig 23.43 AB represents a uniform beam of weight 150 N which rests with the end B on a rough plane inclined

Question Find the tensions in the three strings and the weight W in fig 23.31. AB is horizontal. (Draw an accurate scale figure first. Draw… Read More »Find the tensions in the three strings and the weight W in fig 23.31

Question On a 20-mile bike ride, you ride the first 10 miles at an average speed of 8 mi/h. (a) What must your average speed… Read More »On a 20-mile bike ride you ride the first 10 miles at an average speed of 8 mi/h.

Question IF AN A•C IS REPRESENTED BY I = IoSinωt. CALCULATE THE INSTANTANEOUS VALUE OF SUCH A CURRENT, IF IN A CIRCUIT IT HAS A… Read More »If an a.c is represented by I = IoSinωt. Calculate the instantaneous value

Question Calculate the peak voltage of a mains supply of r.m.s value 220V. Solution Root mean square of the voltage is Vrms = 220V Peak… Read More »Calculate the peak voltage of a mains supply of r.m.s value 220V

Question The current, I in an a.c circuit is given by the equation I = 30sin100πt, where t is the time in seconds. Deduce the… Read More »The current I in an a.c circuit is given by the equation I = 30sin100πt

Question A robotic vehicle, or rover, is exploring the surface of Mars. The landing craft is the origin of the coordinates, and the surrounding Martian… Read More »A robotic vehicle or rover is exploring the surface of Mars

Question Use Eqs. (2.17) where vx = vox + axt and (2.18) where x = xo + ∫vxdt to find vx, and x as functions… Read More »Use Eqs. (2.17) and (2.18) to find v_x, and x as functions of time in the case in which the acceleration is constant