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Showing 1176 to 1200 of 1648 questions (page 48 of 66).

1176. A 2 kg body moving at 5 m s-1 is brought to rest in 0.5 s. The average retarding force is

A. 2.5 N B. 50 N C. 5 N D. 20 N E. 10 N

1177. The work done by the centripetal force on a body moving in a circle at constant speed is

A. maximum B. negative and constant C. equal to the potential energy D. zero E. equal to the kinetic energy

1178. The escape velocity from the surface of the Earth is approximately

A. 11.2 km s-1 B. 7.9 km s-1 C. 3 x 10^8 m s-1 D. 1.6 km s-1 E. 9.8 m s-1

1179. One kilowatt hour is equal to

A. 3.6 x 10^7 J B. 3.6 x 10^3 J C. 3.6 x 10^5 J D. 1 x 10^3 J E. 3.6 x 10^6 J

1180. Power delivered by a constant force F to a body moving with velocity v is

A. F/v B. F x v (vector product) C. F . v D. F/v2 E. F v2

1181. A body of mass m is dropped from height h. At height h/2 the ratio of its kinetic energy to potential energy (measured from the ground) is

A. 2:1 B. 1:1 C. 1:2 D. 1:4 E. 4:1

1182. The work energy principle states that the net work done on a body equals

A. the change in its kinetic energy B. the change in its potential energy C. its total energy D. its momentum E. the power delivered

1183. The SI unit of angular momentum is equivalent to

A. N s B. J s-1 C. N m D. J s E. W s

1184. Centripetal acceleration of a body moving in a circle of radius r with speed v is

A. r/v2 B. vr C. v2/r D. v/r E. v2r

1185. For a vehicle taking a banked curve without friction, the banking angle satisfies

A. tan theta = rg/v2 B. tan theta = v2/rg C. cos theta = v2/rg D. sin theta = v2/rg E. tan theta = v/rg

1186. The moment of inertia of a uniform disc of mass M and radius R about an axis through its centre and perpendicular to its plane is

A. MR2 B. MR2/4 C. 2MR2/5 D. 2MR2/3 E. MR2/2

1187. The orbital period of a geostationary satellite is

A. 12 hours B. 1 hour C. 28 days D. 24 hours E. 365 days

1188. A person in a lift accelerating upwards with acceleration a experiences an apparent weight of

A. mg B. m(g + a) C. ma D. zero E. m(g - a)

1189. Angular velocity and linear velocity for a particle in circular motion are related by

A. omega = v r B. v = omega/r C. v = omega r2 D. omega = v2/r E. v = r omega

1190. The terminal velocity of a small sphere falling through a viscous fluid is proportional to

A. r3 B. 1/r2 C. r2 D. 1/r E. r

1191. Bernoulli's equation is a statement of the conservation of

A. energy B. charge C. momentum D. angular momentum E. mass

1192. A Venturi meter is used to measure

A. atmospheric pressure B. viscosity of a liquid C. density of a liquid D. surface tension E. speed of fluid flow

1193. The SI unit of coefficient of viscosity is

A. N m-2 B. N m s-1 C. kg m-1 D. N s m-2 E. N m

1194. According to Torricelli's theorem, the speed of efflux of a liquid from a small hole at depth h below the free surface is

A. 2gh B. sqrt(2gh) C. sqrt(gh/2) D. sqrt(gh) E. gh

1195. The equation of continuity for an incompressible fluid states that

A. A v is constant B. P + rho g h is constant C. A/v is constant D. rho v is constant E. P v is constant

1196. In simple harmonic motion, the acceleration of the body is

A. zero at the extreme positions B. directly proportional to displacement and in the same direction C. directly proportional to displacement and opposite in direction D. inversely proportional to displacement E. constant

1197. The time period of a simple pendulum is proportional to

A. L B. 1/sqrt(L) C. L2 D. sqrt(L) E. 1/L

1198. The time period of a mass m attached to a spring of spring constant k is

A. 2 pi sqrt(m/k) B. 2 pi sqrt(mk) C. 2 pi sqrt(k/m) D. (1/2 pi) sqrt(m/k) E. 2 pi m k

1199. The total energy of a body executing SHM is proportional to

A. displacement B. inverse of the amplitude C. square root of the amplitude D. amplitude E. square of the amplitude

1200. The phase difference between displacement and acceleration in SHM is

A. 45 degrees B. 180 degrees C. 270 degrees E. 90 degrees

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