QUESTIONS AND ANSWERS

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

Question Sally is driving along a straight highway in her classic 1965 Mustang. At time t = 0, Sally is moving at 10 m/s in… Read More »Sally is driving along a straight highway in her classic 1965 Mustang. At time

Question Find the scalar product Ä – B of the two vectors in Fig. 1.27. The magnitudes of the vectors are A = 4.00 and… Read More »Find the scalar product Ä – B of the two vectors in Fig. 1.27.

Question How does an electron maintain its orbit around the nucleus despite having less potential and more kinetic energy in its bound state? Solution Let… Read More »How does an electron maintain its orbit around

Question You are writing an adventure novel in which the hero escapes across the border with a billion dollars’ worth of gold in his suit-case.… Read More »You are writing an adventure novel in which the hero escapes across the border with a billion dollars’

Question A car accelerates from rest at a constant rate alpha (α) for some time after which it decelerates at a constant rate β to… Read More »a car accelerates from rest at a constant rate alpha

Question A bus accelerates from the rest for time t1 at a constant rate α then retards at a constant rate β for time t2… Read More »a bus accelerates from rest for time t1

Question A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The… Read More »A student stands at the edge of a cliff and throws a stone horizontally