Find the tension in an elevator cable if the 1000-kg elevator is ascending with an acceleration of 1.2 m/s2, upward
a. 11,000 N
c. 8600 N
b. 9800 N
d. 1200 N
A
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Rotational Kinetic Energy: A futuristic design for a car is to have a large flywheel within the car to store kinetic energy. The flywheel is a solid uniform disk of mass 370 kg with a radius of 0.50 m, and it can rotate up to 200 rev/s. Assuming all of this stored kinetic energy could be transferred to the linear speed of the 1500-kg car, find the maximum attainable speed of the car.
Fill in the blank(s) with the appropriate word(s).
The vast majority of pulsars are known only from their pulses in
A) X-rays. B) gamma-rays. C) visible light. D) microwaves. E) radio waves.
Most cosmologists favor the Big Bang theory over other cosmological theories because of
a. a 3-to-1 ratio of hydrogen to helium in stars and interstellar matter. b. cosmological redshifts. c. the cosmic microwave background. d. all of the above.
Atomic Nucleus: In the first nuclear reaction observed, physicists saw an alpha particle (Z = 2) interact with a nitrogen nucleus in air (Z = 7) to produce a proton. The energy of the alpha particle was 55 MeV, enough to enable the nuclei to touch in spite of the Coulomb repulsion. What distance (in fm) between the centers of the alpha particle and the nitrogen was reached? This determines a limit on the radius of the nitrogen nucleus. (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 0.37 fm B. 0.18 fm C. 0.05 fm D. 158.40 fm