It needed the collective genius of mankind to ___ the wheel. (a) perform (b) invent (c) find

The circumference of the front wheel of a cart is 40 ft long and that of the back wheel is 48 ft long.What is the distance travelled by the cart,when the front wheel has done five more revolutions than the rear wheel? (a) 850 ft (b) 950 ft (c) 1200 ft (d) 1450 ft

A uniform rod is placed on two spinning wheels as shown in figure. The axes of the wheels are separated by a distance l=20 cm , the coefficient of friction between that in this case the rod performs harmonic oscillations. Find the period of these oscillations.

A cord of negligible mass is wound round the rim of a flywheel of mass 20 kg and radius 20 cm . A steady pull of 25 N is applied on the cord as shown in Fig. The flywheel is mounted on a horizontal axle with frictionless bearings. (a) Compute the angular acceleration of the wheel. (b) Find the work done by the pull, when 2 m of the cord is unwound. (c) Find also the kinetic energy of the wheel at this point. Assume that the wheel stars from rest. (d) Compare answers to parts (b)and (c).

Find the correct sequence at various steps of herbarium technique:(a) Drying (b) Poisoning ( c) Collection ( d) Labeling ( e) Mounting (f) Deposition (g) Stitching

A wheel of radius 8 units rolls along the diameter of a semicircle of radius 25 units; it bumps into this semicircle.What is the length of the portion of the diameter that cannot be touched by the wheel? 12 (b) 15 (c) 17 (d) 20

A wheel is mounted on frictionless central pivot and it can rotate freely in the vertical plane. There is a horizontal light rod fixed to the wheel below the pivot. There is a small sleeve of mass m which can slide along the rod without friction. The sleeve is connected to a light spring. The other end of the spring is fixed to the rim as shown. The sleeve is at the centre of the rod and the spring is relaxed. Now the wheel is held at rest and the sleeve is moved towards left so as to compress the sprig by some distance. The sleeve and the wheel are released simultaneously from this position. (a) Is it possible that the wheel does not rotate as the sleeve perform SHM on the rod ? (b) Find the value of spring constant k for situation described in (a) to be possible. The distance of rod from centre of the wheel is d .

The circumference of the back-sided wheel of a vehicle is 1 m greater than that of front side wheel. To travel 600 m, the front wheel rotates 30 times more than the back wheel. The circumference of the front wheel is (a) 2m (b) 4m (c) 5m (d) None of these