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Showing 2151 to 2175 of 3046 questions (page 87 of 122).

2151. In a perfectly elastic collision, which quantities are conserved?

A. momentum and mass only B. kinetic energy only C. momentum only D. momentum and kinetic energy E. kinetic energy and mass only

2152. The maximum horizontal range of a projectile is obtained at a launch angle of

A. 45 degrees B. 30 degrees C. 90 degrees D. 60 degrees E. 75 degrees

2153. At the highest point of its trajectory, the velocity of a projectile is

A. horizontal B. vertical and upward C. zero D. vertical and downward E. equal to the launch velocity

2154. A body falling freely from rest covers distances in successive equal intervals of time in the ratio

A. 1:1:1 B. 1:3:5 C. 1:4:9 D. 2:3:4 E. 1:2:3

2155. Rocket propulsion is explained on the basis of

A. Newton's first law B. conservation of angular momentum C. conservation of energy D. law of gravitation E. conservation of linear momentum

2156. The time of flight of a projectile launched with speed v at angle theta over level ground is

A. v2 sin 2theta / g B. 2v cos theta / g C. 2v sin theta / g D. v cos theta / g E. v sin theta / g

2157. 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

2158. 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

2159. 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

2160. 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

2161. 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

2162. 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

2163. 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

2164. 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

2165. 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

2166. 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

2167. 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

2168. The orbital period of a geostationary satellite is

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

2169. 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)

2170. 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

2171. 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

2172. Bernoulli's equation is a statement of the conservation of

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

2173. 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

2174. 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

2175. 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

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