How long have simple machines been around?

Group of answer choices

A: thousands of years

B: 850 years

c: millions of years

d: hundreds of years

Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed.gi) ifn 1, what will happen to the material when transformed material when

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?