Electrons in Earth's upper atmosphere have typical speeds near 5.78 ✕ 105 m/s. (a)
Calculate the magnitude of Earth's magnetic field if an electron's velocity is perpendicular to the magnetic field and its circular path has a radius of 6.79 ✕ 10−2 m.
(b)
Calculate the number of times per second that an electron circles around a magnetic field line.​

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

What part of the ear is names after tools, such as the hammer and the anvil?