Earth is like a bar magnet. what does this mean about its magnetic poles?

question 5 options:

a. there is only a magnetic north pole.

b. there are both magnetic north and south poles.

c. there is only a magnetic south pole.

d. there are two magnetic north poles.

Would corn syrup, molasses, or pancake syrup make a good lubricant in a car engine? explain your answer.

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied. true or false