The ____________________ theory describes pulsars as rotating neutron stars with strong magnetic fields that confine high speed charged particles in two beams emanating from the magnetic poles of the neutron star
Fill in the blank(s) with correct word
lighthouse
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A steel rod (Es 5 210 GPa, dr 5 12 mm, ctes 5 12 3 1026/°C) is held stress-free between rigid walls by a clevis and pin (dp 5 15 mm) assembly at each end. If the allowable shear stress in the pin is 45 MPa and the allowable normal stress in the rod is 70 MPa, the maximum permissible temperature drop DT is approximately:
(A) 14 8C
(B) 20 8C
(C) 28 8C
(D) 40 8C
Material that falls into a black hole can be seen by the electromagnetic radiation it emits before it reaches the event horizon
Indicate whether the statement is true or false
A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the momentum of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 2.51 × 10-19 kg ? m/s B) 2.89 × 10-19 kg ? m/s C) 4.34 × 10-19 kg ? m/s D) 5.01 × 10-19 kg ? m/s E) 8.68 × 10-19 kg ? m/s
A baseball infielder, mass 78.0 kg, jumps up with velocity 3.50 m/s and catches a 0.195-kg baseball moving horizontally at 55.0 m/s. Of the following, which is closest to the final momentum of the system, infielder and baseball?
a. 273 kg/m/s b. 328 kg/m/s c. 284 kg/m/s d. 240 kg/m/s e. 293 kg/m/s