The maximum mass for a white dwarf is 1.4 solar masses
Indicate whether the statement is true or false
TRUE
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In a region of space where the magnetic field of the Earth has a magnitude of 80 ?T and is directed 30° below the horizontal, a 50-cm length of wire oriented horizontally along an east-west direction is moved horizontally to the south with a speed of 20 m/s. What is the magnitude of the induced potential difference between the ends of this wire?
A. 0.45 mV B. 0.35 mV C. 0.30 mV D. 0.40 mV E. 0.69 mV
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
a. ?0.21 kJ b. ?0.47 kJ c. ?0.40 kJ d. ?0.34 kJ e. ?0.69 kJ
In a conductor, what moves?
a. Electrons b. Neutrons c. Quarks d. Protons
Given that the total number of atoms on our planet remains fairly constant, how is it ever possible to deplete a natural resource such as a metal?
A) The problem remains that not everyone recycles as they should. B) Recycling only forestalls the inevitable depletion of metal resources. C) The atoms don't leave our planet, which is why naturally occurring materials never really reach the point of depletion. D) The problem is with the expense of collecting metal atoms that are uniformly dispersed.