"MeV/c2" is a unit for
a. energy.
b. mass.
c. momentum.
d. nuclear force.
b
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Magnesium has 12 protons. How many electrons are in its second energy level?
a. two b. four c. six d. eight e. ten
A fastener bolt for the airframe of a glider has a cross-sectional area of 1.0 square cm and a length of 4.0 cm. The part must be able withstand a tensile force of 1.0 × 104 N, and as a factor of safety this tensile force can produce a stress of no more than 50 percent of the tensile yield stress in the bolt. For damage tolerance the bolt must have at least 10 percent strain to fracture. Because weight is critical for this glider design the maximum weight possible for this bolt is 8.0 g. The bolt is not subject to high or low temperatures. Of the materials covered in this chapter what would be the best material to select? Because this is an aircraft part it not necessary to choose the cheapest material, but excessive cost should be avoided.
What will be an ideal response?
If you could measure the mass of a moving object, you would find that it was greater than its value when stationary
Indicate whether the statement is true or false
Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin?
a. 200 ?T b. 600 ?T c. 450 ?T d. 300 ?T e. 400 ?T