As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose? (c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
What will be an ideal response?
4.2 × 10-21 kg ? m.s
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A proton initially moves left to right long the x axis at a speed of 9.0 × 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.8 m before coming to rest. If the proton's mass and charge are 1.67 × 10^?27 kg and 1.60 × 10^?19 C respectively, what is the magnitude of the electric field?
a. 4.3E+1 N/C b. 5.3E–2 N/C c. 5.3E–1 N/C d. 6.6E–1 N/C e. 1.1E+0 N/C
Astronomers can tell whether a light source approaches or recedes from Earth by
A) its temperature. B) its change in temperature. C) its absorption spectra. D) the Doppler effect. E) all of the above
Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the magnetic force on the electron. (e = 1.60 × 10-19 C)
A. 2.8 × 10-10 N B. 3.2 × 10-10 N C. 2.8 × 10-12 N D. 3.2 × 10-12 N E. 0 N
Intensity of Sound: The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the power emitted by the source?
A. 2.1 × 10-8 W B. 2.7 × 10-7 W C. 2.1 × 10-6 W D. 2.7 × 10-5 W