If your mass is 60 kilograms on Earth, what would your mass be on the Moon?
A) 10 pounds
B) 10 kilograms
C) 360 kilograms
D) 60 kilograms
E) 60 pounds
D) 60 kilograms
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A uniaxial composite material is made from 75 vol % continuous kevlar fibers and 25 vol % epoxy. The kevlar fibers have an elastic modulus of 131×109 Pa and a tensile strength of 4.0×109 Pa. The epoxy resin has an elastic modulus of 5×109 Pa and a tensile strength of 50×106 Pa. The composite must withstand an axial stress of 0.5×109 Pa and a transverse stress of 4×106 Pa. The axial and transverse stresses are not applied simultaneously. Assume that both the kevlar fibers and the epoxy matrix are elastic up to their failure.
(a) Determine the elastic modulus in the axial direction of this composite material. (b) Determine the elastic modulus in the transverse direction of this composite material. (c) Determine the axial strain in the composite due to the axial stress alone. (d) Determine the stresses in the fibers and in the matrix for the axial stress. (e) Can each of the components of this composite withstand the axial stress, and if not, what is the fracture stress? (f) What is the transverse fracture stress? Can the composite withstand the transverse stress applied alone?
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. Where is the final image formed?
A) 25 cm in front of the second lens B) 8 cm in front of the second lens C) 8 cm after the second lens D) 10 cm after the second lens E) 25 cm after the second lens
It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If the elastic modulus is 2.0 × 10^11 N/m2 and the density of steel is 7.8 × 10^3 kg/m3, approximately how many times faster is the speed of sound in the track than in air? (vair ? 340 m/s.)
a. 20 b. 5 c. 10 d. 15 e. 25
A circuit has two identical resistors, each with resistance R, connected in series. They add to give an equivalent resistance of 2R. If any internal resistance is negligible, which of the following would increase the current in the circuit the most?
1.add another resistor, R, in series 2.take away one of the resistors 3.add another resistor, R, in parallel to those already in series 4.It depends on whether the resistance is greater or less than 1 ?.