Oort-cloud comets are so far from the Sun that the gravity of neighboring stars can alter their orbits
Indicate whether the statement is true or false
TRUE
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The force of gravity from one object extends to infinity never going to zero.When we say that gravitation is universal we mean that
a. the Earth exerts gravitational force on objects on its surface b. the Earth exerts a gravitational force on its moon and vice versa c. the Earth, moon and sun exert gravitational forces on each other d. all material objects in the universe exert gravitational forces on one another.
As a copper wire is heated, its length increases by 0.50%. What is the change of the temperature of the wire? (?Cu = 16.6 × 10^?6/C°)
a. 83.0°C b. 301°C c. 60.2°C d. 226°C e. 377°C
The phase angle of a series RL ac circuit with a 100-? resistor and a 20.0-mH inductor is 70.0°. What is the inductive reactance of this circuit?
A) 150 ? B) 175 ? C) 100 ? D) 275 ? E) 200 ?
When current is flowing in a superconductor, which statement is not true?
a. The resistance is zero. b. No power is given off in the form of heat. c. A battery is needed to keep the current going. d. Electrical charges are moving.