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Showing 876 to 900 of 1648 questions (page 36 of 66).

876. Two vectors of magnitudes 3 and 4 units give a resultant of 7 units. The angle between them is

A. 90 degrees B. 0 degrees C. 180 degrees D. 120 degrees E. 45 degrees

877. The cross product of a vector with itself is

A. its magnitude squared B. undefined C. the null vector D. a unit vector E. twice the vector

878. The magnitude of the cross product of two vectors of magnitudes 2 and 3 units with 30 degrees between them is

A. 3 B. 6 D. 5.2 E. 1.5

879. A force of 5 N acts perpendicular to a spanner at a distance of 0.2 m from the pivot. The torque produced is

A. 0.04 N m B. 10 N m C. 25 N m D. 1 N m E. 5 N m

880. The projection of vector A along vector B is given by

A. A x B B. A.B / |A| C. A.B / |B| D. A.B E. |A| |B|

881. A couple consists of

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

882. The area under a velocity time graph represents

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

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

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

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

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

885. The slope of a momentum time graph gives

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

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

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

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

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

888. 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

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

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

890. One joule is equal to

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

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

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

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

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

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

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

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

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

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

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

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

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

897. The angular displacement in one complete revolution is

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

898. 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

899. 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. 2 N C. 4 N D. 16 N E. 8 N

900. The rotational kinetic energy of a rigid body is

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

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