The proton is believed to consist of what quark combination? (up, down, strange, charm, top, bottom)
A) uud
B) ddu
C) uds
D) ttb
E) bbt
A
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Match the words at the left to the correct blanks in the sentences at right. You may use the same words more than once.
The radius R of a nucleus of mass number A is given by R = R0 A1/3, where R0 = 1.2 × 10-15 m,
calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10-27 kg.
A transformer is a device used to
A) transform an alternating current into a direct current. B) transform a direct current into an alternating current. C) increase or decrease an ac voltage. D) increase or decrease a dc voltage.
A simply supported steel beam of length L 5 1.5 m and rectangular cross section (h 5 75 mm, b 5 20 mm) carries a uniform load of q 5 48 kN/m that includes its own weight. The maximum transverse shear stress on the cross section at 0.25 m from the left support is approximately:
(A) 20 MPa
(B) 24 MPa
(C) 30 MPa
(D) 36 MPa
