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Showing 726 to 750 of 3046 questions (page 30 of 122).

726. If A + B = A - B, then vector B must be

A. a null vector B. parallel to A C. equal to A D. perpendicular to A E. a unit vector

727. Torque is defined as

A. F x r B. F . r C. r x F D. r + F E. r . F

728. For a body in complete equilibrium, the number of independent conditions that must be satisfied is

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

729. The scalar product of two mutually perpendicular vectors is

A. negative B. zero C. equal to their cross product D. maximum E. unity

730. A vector of magnitude 10 units makes an angle of 30 degrees with the x-axis. Its y-component is

A. 2.5 units B. 10 units C. 8.66 units D. 7.07 units E. 5 units

731. Newton's second law of motion provides the definition of

A. momentum B. force C. action and reaction D. inertia E. mass

732. The SI unit of impulse is equivalent to

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

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

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

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

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

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

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

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

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

737. Rocket propulsion is explained on the basis of

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

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

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

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

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

740. 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 kinetic energy D. zero E. equal to the potential energy

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

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

742. One kilowatt hour is equal to

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

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

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

744. 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. 1:4 B. 1:1 C. 2:1 D. 1:2 E. 4:1

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

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

746. The SI unit of angular momentum is equivalent to

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

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

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

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

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

749. 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. 2MR2/3 D. 2MR2/5 E. MR2/2

750. The orbital period of a geostationary satellite is

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

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