An electron is accelerated from rest through a potential difference of 3.75 kV. It enters a region where a uniform 4.0-mT magnetic field is perpendicular to the velocity of the electron
Calculate the radius of the path this electron will follow in the magnetic field. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg) A) 1.2 cm
B) 2.2 cm
C) 3.2 cm
D) 4.2 cm
E) 5.2 cm
E
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Newton's Second Law in 1 Dimension: An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?
A. 0.27 m/s2 B. 1.1 m/s2 C. 2.6 m/s2 D. 11 m/s2
In addition to the electric force law and the magnetic force law, the other key principle that is needed to explain electromagnetic waves is
A) electromagnetic forces can be felt across a distance. B) Newton's law of motion. C) electromagnetic fields are established instantaneously. D) forces always come in pairs, so for every sender of electromagnetic force there must be a receiver. E) electromagnetic fields are not established instantaneously.
Which of the following statements best describes a relatively polar bond?
A) a very electronegative atom and a weakly electronegative atom are covalently bound B) two very electronegative atoms are covalently bound C) two very electronegative atoms undergo ionic bonding D) two weakly electronegative atoms undergo ionic bonding E) none of the above
What is the potential at a distance of 0.0529 nm from a proton?
A. 13.6 no B. -13.6 no C. 27.2 V D. -27.2 no E. 9.11 pC