A proton has a speed of 3.0 × 106 m/s in a direction perpendicular to a uniform magnetic field, and the proton moves in a circle of radius 0.20 m. What is the magnitude of the magnetic field?
A) 0.040 T
B) 0.080 T
C) 0.16 T
D) 0.24 T
E) 0.32 T
C
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A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path
In this field, the proton follows a circular arc having a radius of curvature of 1.84 cm. What was the potential difference V? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C) What will be an ideal response?
When Earth was young, its atmosphere had no free ____
a. nitrogen b. oxygen c. helium d. carbon dioxide e. water vapor
A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
A. 2.1 m/s B. 1.7 m/s C. 1.9 m/s D. 1.5 m/s E. 2.3 m/s
Two water waves, call them X and Y, have the same amplitude but different wavelengths: X has a longer wavelength than Y. Regarding their frequencies and their energies,
A) X has the larger (higher) frequency and carries the greater energy. B) Y has the larger frequency and X carries the greater energy. C) Y has the larger frequency and carries the greater energy. D) X has the larger frequency and Y carries the greater energy. E) Y has the larger frequency and the two waves carry the same energy.