The electron gun in a television tube accelerates electrons (mass = 9.11 × 10^?31 kg, charge = 1.60 × 10^?19 C) from rest to 3.00 × 10^7 m/s within a distance of 2.00 cm. What electric field is required?
128 000 N/C
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Astronomers observe huge bubbles of hot gas, some over a thousand light years across, in the Milky Way. What is their cause?
What will be an ideal response?
As a space shuttle is launched into orbit, the direction of its acceleration
a. always points upward. b. always points downward. c. varies between pointing upward and pointing downward. d. stays constant.
The region around Earth where the magnetic field traps charged particles is the:
A) ozone layer. B) exosphere. C) Van Allen Radiation Belts. D) corona. E) aurora borealis and australis.
A very long solenoid has 1.0 × 106 turns per meter and a cross-sectional area of 2.0 × 106 m2. A short, secondary coil with 1.0 × 103 turns is wound over the solenoid's midpoint
What emf is induced in the secondary coil if the current in the solenoid is changing at a rate of 4.0 A/s? A) 1.0 V B) 2.7 V C) 1.6 V D) 0.52 V E) 4.4 V