Imagine two artificial satellites orbiting Earth at the same distance. One satellite has a greater mass than the other. Which of the following would be true about their motion?
A. The satellite with the greater mass is being pulled toward Earth with less of a force than the other satellite.
B. The satellite with the greater mass is being pulled toward Earth with a greater force than the other.
C. The two satellites are being pulled with equal force by the moon.
D. The two satellites are being pulled toward Earth with equal force.
Imagine two artificial satellites with equal masses orbiting Earth. One satellite is orbiting closer to Earth than the other. Which of the following would be true about their motions?
A. The satellite closer to Earth will be pulled toward Earth with the same gravitational pull as the other satellite.
B. The satellite closer to Earth will be pulled toward Earth with less gravitational pull than the other satellite.
C. Both satellites will be pulled with equal force toward the moon.
D. The satellite closer to Earth will be pulled toward Earth with more gravitational pull than the other satellite.
How will resistance change when the voltage increases in an electric circuit if the current remains constant?
A. It will decrease.
B. It will stay the same.
C. It will increase.
D. It will decrease, then increase.
Answer (2)
B
It comes from Newton's law of universal gravitation. ,
F = G r 2 m 1 m 2 Where: F is the force between the masses, (the one we are looking for)G is the gravitational constant,m1 is the first mass (Earth)m2 is the second mass (sattelite)r is the distance between the centers of the masses.As you can see except for m2, all other values are the same. If mass is bigger the force grows.
D. Again check the formula. The bigger distance, the smaller force. So, closer = bigger force. 3.C It will increase.Ohm's law: I = R V Where: I is the current. V is voltage R is the resistance. In order for current to remain the same, while voltage increases, the resistance has to increase accordingly.
The first question's answer is B, relating to the gravitational force on satellites based on their mass. The second is D, as the closer satellite experiences a stronger gravitational pull. The third answer is C, as increasing voltage while keeping current constant results in increased resistance.
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