Mechanics | Relativity Answers

A screw has 5 thread to the centimeter The effort arm is 10 meter long and the efficiency of the screw is 80 percent. What load is an effort of 250 Newton overcome when using the machine. What is the wasted work. (π 22\7)

Q1.To find the optimum shape for a cross-section of a beam against bending, beam sections of a square, circle and equilateral triangle with the same cross-sectional area (A) are considered. If the beams have the same length (L), Young’s Modulus (E) and support condition, determine which shape of the beam is the best against bending?

To find the optimum shape for a cross-section of a beam against bending, beam sections of a square, circle and equilateral triangle with the same cross-sectional area (A) are considered. If the beams have the same length (L), Young’s Modulus (E) and support condition, determine which shape of the beam is the best against bending?

A deep sea diver is at a depth of 125m below sea level. If the density of sea water is 1025kgm-³ where g=10Nkg-¹ determine the pressure on the diver due to the sea water. If atmospheric pressure is 101000Pa, determine the total pressure on the diver

A ball is thrown on level ground with a speed of 20.0 m/s at an angle of 40.0 deg with the ground. There is a 3.0 m high femce at a distance of 35.0 m from the point of release (a) will the ball hit the fence or go over it? (B) find the velocity (magnitude and direction) of the ball when it is at 35.0 m from the point of release where it hits the fence and goes over it.

If the centripetal acceleration for an object is 10m/s2 , Calculate the centripetal acceleration for the same object if its velocity is doubled and radius of rotation decreases to its half value

A plane wave has equation y=25sin (120t-4x). Find the
(I) amplitude
(II) wavelength
(III) wave velocity
(iv) frequency and period of the wave

(where y and x are in metres, t is in seconds)

A salesperson leaves the office and drives 26 km due north along a straight highway. A turn is made onto a highway that leads in the direction 30.0° north of east. The driver continues on the highway for a distance of 62 km and then stops. Using graphical methods, what is the total displacement of the salesperson from the office?
Why the answer is 1. Approximately 79 km?

When we push a book on table and leave it travels a distance and stops due to friction
But I want to know that when we slide the book on table by constantly keeping our hand over it then we suddenly stop sliding then at that instant the book stops, so does that mean that friction.is the reason or the force which we were applying has become zero and has stopped its motion?

A tow truck pulls a 1300 kg car stalled in a muddy road. What is the power of the truck if it moves the car to a distance of 5 m in 15 s? The coefficient of friction between the car tires and the road is 0.55. Assume that the acceleration of the car is 1m/s2