Almost all the helium in the universe was formed between 2-15 minutes after the Big Bang
Indicate whether the statement is true or false
TRUE
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A particle (mass = 6.0 mg) moves with a speed of 4.0 km/s in a direction that makes an angle of 37° above the positive x axis in the xy plane. At the instant it enters a magnetic field of (5.0 ) mT it experiences an acceleration of (8.0 ) m/s2 . What is the charge of the particle?
a. ?4.8 ?C b. 4.0 ?C c. ?4.0 ?C d. 4.8 ?C e. ?5.0 ?C
What is an electric field?
a. The region of space around an electric charge. b. The force that would be exerted on a unit of positive charge placed if it were placed at a specific point in space. c. The charge on an object if it were placed at a specific point in space. d. The balance of the charges on an object if it were placed at a specific point in space. e. The force on an object created by a unit of positive charge.
A proton (mass = 1.67 × 10?27 kg, charge = 1.60 × 10?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB?VA.
A. +15 V B. ?15 V C. ?33 V D. +33 V E. ?20 V
In an RLC series circuit, if the AC frequency is decreased to a very small value, what value does the phase angle between the current and voltage approach?
a. 90° b. 0° c. –90° d. 45°