The pulsations from a neutron star are due to
A) the gas that surrounds it.
B) its large mass.
C) its rapid spinning motion.
D) the vibrations of its neutrons.
E) the nuclear reactions taking place in its center.
C
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A composite material has a matrix of epoxy with an elastic modulus of 5 GPa and a reinforcement of E-glass fibers with an elastic modulus of 72.4 GPa. Use a computer program to calculate the elastic modulus in both the axial and transverse directions as a function of volume fraction of fibers. Use increments of 0.1 volume fraction and terminate the calculations at a fiber volume fraction of 0.8.
What will be an ideal response?
Today, Mars has virtually no magnetic field
Indicate whether the statement is true or false
A neutron has a mass of 1.67 × 10^?27 kg. Its de Broglie wavelength is 1.4 × 10^?10 m. What temperature would it correspond to if we had a monatomic gas having the same average kinetic energy (in °C)?
a. 273 b. 25 c. 36 d. 309 e. 51
When a photon collides with a free electron at rest and the direction of motion of the photon changes,
a. the magnitude of the momentum of the photon does not change. b. the momentum of the electron does not change. c. the kinetic energy of the electron does not change. d. the total energy of the photon does not change. e. both the magnitude of the momentum and the total energy of the photon decrease.