The point of a planet's orbit farthest from the Sun is called the ______________
Fill in the blank(s) with correct word
aphelion
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An 90-kg satellite orbits a distant planet with a radius of 4000 km and a period of 280 min. From the radius and period, you calculate the satellite's acceleration to be 0.56 m/s2. What is the gravitational force on the satellite?
A. 50.4 N B. 90 N C. 720 N D. 12,000 N
A long solenoid (radius = 3.0 cm, 2 500 turns per meter) carries a current given by I = 0.30 sin(200 t) A, where t is measured in s. When t = 2.5 ms, what is the magnitude of the induced electric field at a point which is 4.0 cm from the axis of the solenoid?
a. 9.3 × 10^?3 V/m b. 8.0 × 10^?3 V/m c. 6.7 × 10^?3 V/m d. 5.3 × 10^?3 V/m e. 1.9 × 10^?3 V/m
Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
A. 41 J B. 16 J C. 64 J D. 10 J E. 80 J
Superconductors have a primary advantage in that they will _______
a. reduce heating losses in transmission lines b. provide large magnetic fields for levitation c. be able to conduct more current d. allow electric motors to run almost forever