An atom with fewer electrons than protons is a __________
Fill in the blank(s) with correct word
positive ion
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Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete one orbit?
A. 320 days B. 160 days C. 20 days D. 80 days
A small person with a surface area of about 1.0 m2 must (by the Stefan–Boltzmann law) radiate energy at a rate that would require eating 11,000 food calories a day if they are naked in a vacuum in deep space. Which do you think is the most important reason that someone sitting in a normal room requires less than 2000 calories a day?
A. Wearing clothes reduces the radiation loss. B. Wearing clothes reduces heat loss due to convection. C. A person has an emissivity ? much smaller than 1. D. The person absorbs radiation from the room. E. The surrounding air insulates the person. F. Something else (specify).
A sealed 26- tank is filled with 2000 moles of oxygen gas (O2) at an initial temperature of 270 K
The gas is heated to a final temperature of 460 K. The ATOMIC mass of oxygen is 16.0 g/mol, and the ideal gas constant is R = 8.314 J/mol · K = 0.0821 L · atm/mol · K. The final pressure of the gas is closest to A) 0.29 MPa. B) 0.31 MPa. C) 0.33 MPa. D) 0.34 MPa. E) 0.36 MPa.
The segment of wire (total length including portions of incoming and outgoing wire = 6R) is formed into the shape shown and carries a current I. What is the magnitude of the resulting magnetic field at the point P?
A.
B.
C.
D.
E.
