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Showing 976 to 1000 of 3046 questions (page 40 of 122).

976. A couple consists of

A. two equal and opposite parallel forces not acting along the same line B. two equal forces in the same direction C. three concurrent forces D. a single force through the centre of mass E. two unequal opposite forces

977. The area under a velocity time graph represents

A. acceleration B. displacement C. momentum D. power E. force

978. A ball is thrown vertically upwards with 19.6 m s-1. The maximum height reached is

A. 29.4 m B. 39.2 m C. 9.8 m D. 19.6 m E. 4.9 m

979. A stone is dropped from rest and falls 45 m. The time taken is about

A. 4.5 s B. 9.0 s C. 3.0 s D. 2.1 s E. 1.5 s

980. The slope of a momentum time graph gives

A. kinetic energy B. impulse C. power D. force E. velocity

981. When a bomb at rest explodes into two unequal fragments, the two fragments have

A. equal kinetic energies B. equal speeds C. equal masses D. zero total kinetic energy E. equal and opposite momenta

982. The coefficient of restitution for a perfectly elastic collision is

A. 1 B. 0.5 C. between 0 and 1 but never 1 E. greater than 1

983. A ball of mass m strikes a wall normally with speed v and rebounds with the same speed. The magnitude of the change in its momentum is

A. 4mv B. 2mv C. zero D. mv E. mv/2

984. A body moves with uniform velocity. The net force acting on it is

A. maximum B. proportional to its speed C. zero D. equal to its weight E. equal to its momentum

985. One joule is equal to

A. 10^5 erg B. 10^7 erg C. 10^9 erg D. 10^3 erg E. 10^-7 erg

986. The work done in lifting a 5 kg mass through a vertical height of 2 m is about

A. 49 J B. 10 J C. 196 J D. 2.5 J E. 98 J

987. The kinetic energy of a 2 kg body moving at 3 m s-1 is

A. 6 J B. 18 J C. 3 J D. 9 J E. 12 J

988. A crane lifts a 100 kg load at a steady 2 m s-1. The power developed is about

A. 1960 W B. 200 W C. 490 W D. 3920 W E. 980 W

989. If the momentum of a body is doubled, its kinetic energy becomes

A. eight times B. four times C. unchanged D. double E. half

990. Which of the following is a non-conservative force?

A. friction B. magnetic force on a static charge C. gravitational force D. electrostatic force E. elastic spring force

991. A machine takes in 500 J and delivers 400 J of useful output. Its efficiency is

A. 20% B. 60% C. 80% D. 125% E. 40%

992. The angular displacement in one complete revolution is

A. pi/2 radians B. 1 radian C. pi radians D. 2 pi radians E. 4 pi radians

993. A wheel rotating at 300 revolutions per minute has an angular speed of about

A. 18.8 rad s-1 B. 62.8 rad s-1 C. 5 rad s-1 D. 300 rad s-1 E. 31.4 rad s-1

994. The centripetal force on a 2 kg body moving at 4 m s-1 in a circle of radius 2 m is

A. 32 N B. 4 N C. 2 N D. 16 N E. 8 N

995. The rotational kinetic energy of a rigid body is

A. I omega B. (1/2)I omega2 C. (1/2)m v omega D. I omega2 E. (1/2)I omega

996. The rotational analogue of Newton's second law is

A. p = mv B. F = ma C. tau = I alpha D. tau = r x F E. L = I omega

997. An astronaut in an orbiting spacecraft feels weightless because

A. the mass of the astronaut becomes zero B. air resistance balances gravity C. gravity is absent at that altitude D. the spacecraft is not accelerating E. the spacecraft and astronaut have the same centripetal acceleration

998. Artificial gravity in a rotating space station is produced by

A. the centripetal acceleration of rotation B. magnetic fields C. increasing the mass of the station D. reducing the orbital radius E. electrostatic attraction

999. According to Stokes' law, the drag force on a sphere of radius r moving with speed v through a fluid of viscosity eta is

A. 6 pi eta v / r B. 6 pi eta r2 v C. 4 pi eta r v D. 6 pi eta r v E. (1/6) pi eta r v

1000. The gauge pressure at a depth of 10 m in water is about

A. 9.8 x 10^4 Pa B. 9.8 x 10^2 Pa C. 9.8 x 10^3 Pa D. 9.8 x 10^5 Pa E. 1.0 x 10^2 Pa

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