If a white dwarf gains enough mass from a nearby star to exceed its Chandrasekhar limit it will become a nova
Indicate whether the statement is true or false
FALSE
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Which of the following statements about the accelerations and gravitational forces between a planet and a star is true?
A) Accelerations and forces are both equal and opposite. B) Forces are equal and opposite; the star is accelerated more than the planet. C) Acceleration is equal and opposite; the planet feels more force more than the star. D) Acceleration is equal and opposite; the star feels more force more than the planet. E) Forces are equal and opposite; the planet is accelerated more than the star.
Two very large parallel metal plates, separated by 0.20 m, are connected across a 12-V source of potential. An electron is released from rest at a location 0.10 m from the negative plate
When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy has the electron gained? (e = 1.60 × 10-19 C) A) 7.2 × 10-19 J B) 2.4 × 10-19 J C) 9.6 × 10-19 J D) 4.8 × 10-19 J
Kinetic Energy: An electron has a speed of 0.783c. Through what potential difference would the electron need to be accelerated from rest in order to reach this speed? The mass energy of an electron is 0.511 MeV.
A. 310 kV B. 260 kV C. 360 kV D. 400 kV
Which of the following contributes to Venus being so hot?
A) It is closer than Earth to the Sun. B) Its atmosphere is much denser than the Earth's. C) Its atmosphere is made chiefly of carbon dioxide. D) It has very little axial tilt so the equator is always directly exposed to the Sun. E) All of the above are factors.