Mechanics | Relativity Answers

The activity of a radioactive sample after 10 minutes is 1/5 of its original activity the mean life of radioactive substance in seconds

The wooden members A and B are to be joined by plywood splice plates which will be fully glued on the surfaces in contact.As part of the design of the joint and knowing that the clearance between the ends of the members is to be 8mm, determine the smallest allowable length L if the average shearing stress in the glue is not to exceed 800kPa.

A stone weigh 200 pounds is suspended from a rope the stone is pulled aside comes to rest when a horizontal force of 130 pounds is applied. What is the tension in the rope? what angle does the rope makes with the horizontal?

at what speed should backlog be more so that may appear to lose 1 minute in each hour

What velocity should a clock be moved related to the observer so that it may seems to lose 1 minute per day

A body of mass 10kg is suspended by inextensible string from a nail 0 and pulled by horizontal force F until the angle of inclination of the string to the vertical is 30° calculate the value of F and the tension T in the string.

There’s a sign hanging from two ropes, the sign weighs 60kg. The angle in the top left is at 60 degrees and the angle in the top right is 30 degrees. What is tension in the wires

A wheel is rotating at 30 revolutions per minute How many degrees has it rotated in 0.5 seconds?

Determine the diameter of the largest circular hole which can be punched into a sheet of polystyrene 6mm thick, knowing that the force exerted by the punch is 45KN and that a 55MPa average shearing stress is required to cause the material to fail.

What is the total energy of an electron when its momentum is 10 times its rest mass multiplied by the light velocity?