Which of the following statements about strong or weak acids is true?
A) A weak acid and a strong acid at the same concentration are equally corrosive.
B) A weak acid readily forms ions when dissolved in water.
C) A strong acid will never react with a strong base.
D) A weak acid will react with a strong base.
Answer: D
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A circular window of 30.0 cm diameter in a submarine can withstand a maximum force of 1.88 × 106 N. What is the maximum depth to which the submarine can go without damaging the window?
A) 750 m B) 2.70 km C) 945 m D) 1.33 km E) 1.20 km
What forces are included in a free-body diagram for an object? a. The forces acting on the object and the forces the object exerts on any other objects it is in contact with. b. The forces acting on the object and the forces the object exerts on all other objects in the system
c. Only the forces acting on the object. d. Only forces internal to the object.
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
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The volume of water that flows past a given point in a channel during a specified time is called
A) load. B) gradient. C) discharge. D) runoff.