Dark matter is purely hypothetical, because we have no way of detecting its presence
Indicate whether the statement is true or false
FALSE
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Physical Pendulum: A thin hoop is supported in a vertical plane by a nail. What should the radius of the hoop be in order for it to have a period of oscillation of 1.00 s? The moment of inertia of a hoop of mass M and radius R about a point on its rim is 2MR2.
A. 0.0154 m B. 0.0621 m C. 0.124 m D. 0.1876 m E. 0.248 m
Four equal positive charges are placed at the corners of a square. The force on a +1 C charge placed at the center due to any single charge is 10 N. The value of the electric field at the center due to the charges at the corners is ________ N/C.
Fill in the blank(s) with the appropriate word(s).
For a nova to occur, the system must have already been a
A) astrometric binary. B) detached binary. C) spectroscopic binary. D) mass-transfer binary. E) eclipsing binary.
An alpha particle (mass = 6.68 × 10^-27 kg) is emitted from a radioactive nucleus with an energy of 6.22 MeV. How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10^-13 J)
a. 3.70 × 10^6 m/s c. 1.55 × 10^7 m/s b. 1.73 × 10^7 m/s d. 1.85 × 10^6 m/s