Mechanics | Relativity Answers

You are using a wheel and axle as a simple machine. You applied a force of 30 lb to the rim of the wheel so that it can lift a load of 240 lb. The diameters of the wheel and axle are 3 feet and 4 inches, respectively. Determine the efficiency of the machine.

A yacht is going 10kmh-1 20° north of east relative to the ground when a person slipped on a banana peel and fell off the yacht. He was carried off with the current at 8kmh-1 west. What is the relative velocity of the person in respect to the yacht?

a bullet of mass m=3g, travelling at a velocity of v= 500 m/s, imbeds itself in the wooden block of a ballistic pendulum. if the wooden block has a mass of M= 0.3kg, to what height does the "bullet-block" combination rise

Find the speed of sound in water which has a Young's Modulus of 2.1×10^-9 N/m2 at a temperature of 0 and a density of 1000kgm/m3

What will happen to the centre of gravity of a human if he/she carries book in right hand while in standing position

A man is walking over a dome of 10 m in radius. how far can he descend from the dome without slipping? take the coefficient of friction between the surface of the dome and the shoe of the man 0.6.

A 600-g solid sphere has a diameter of 10 cm rotates at 600 revolutions per minute about an

axis through its center. Determine the kinetic energy of the system.

A force of 16 N acts tangent to the edge of a solid cylinder weighing 18 N and which has a

diameter of 76 cm. Determine the kinetic energy of the cylinder after 15 s.

A 2-kg disk has a radius of 18 cm and rotates with an angular acceleration of 12 rad/s2

about

an axis through its center and perpendicular to the plane of the disk. Determine the tangential

force at the rim of the disk

An automobile accelerates uniformly from rest and reaches a velocity of 22 m/s in 9 s. The tire 

diameter is 58 cm. Determine the number of revolutions the tire makes during this motion 

and the final angular velocity of the tire in revolutions per second