A suspended object A is attracted to a neutral wall. It's also attracted to a positively-charged object B. Which of the following is true about object A?
1.It is uncharged.
2.It has a negative charge.
3.It has a positive charge.
4.It may be either charged or uncharged.
2
Physics & Space Science
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Two masses m1 and m2, having m1 > m2, are launched with the same speed in the direction a. Which mass reaches the greatest height?
The diagram shows a circular wire loop of radius R carrying current I. What is the direction of the magnetic field, B, at the center of the loop?
A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is
A) less. B) the same. C) more.
Physics & Space Science
A 1500-W heater is connected to a 120-V line for 2.0 hours. How much thermal energy is produced?
A) 1.5 kJ B) 3.0 kJ C) 0.18 MJ D) 11 MJ
Physics & Space Science