What is the meaning of the expression ?F = 0?
What will be an ideal response?
Answer: This is the mathematical expression for the equilibrium rule, which states that the vector sum of the forces acting on an object is equal to zero if that object is in a state of rest, or a state of unchanging velocity. "Vector sum" tells us that direction is essential. For example, if an object that is pulled to the left doesn't move, then an equal and opposite force must be pulling on the right, causing the total pull to be zero. No change in the object's motion is evidence of
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Exhibit 15-1
A dictator has built a bunker for his use in emergencies. Its dimensions are shown below. When it floods to ground level during a tropical storm, air is trapped above the dashed line in the bunker.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 15-1. The absolute pressure at point A, in Pa, is
A. 3.92 × 105. B. 4.90 × 105. C. 5.39 × 105. D. 5.88 × 105. E. 6.89 × 105.
A fisherman casts his bait toward the river at an angle of 25° above the horizontal
As the line unravels, he notices that the bait and hook reach a maximum height of What was the initial velocity he launched the bait with? Assume that the line exerts no appreciable drag force on the bait and hook and that air resistance is negligible. A) 18 m/s B) 7.9 m/s C) 7.6 m/s D) 6.3 m/s
The only force acting on a 1.8-kg body as it moves along the x axis is given by Fx = ?(3.0x) N, where x is in m. If the velocity of the body at x = 0 is vx = +8.0 m/s, at what value of x will the body have a velocity of +4.0 m/s?
a. 5.7 m b. 5.4 m c. 4.8 m d. 4.1 m e. 6.6 m
A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 electrons are now placed on the negative plate of the capacitor, the voltage between the plates changes by
a. -5.0 V. b. -1.1 V. c. 0 V. d. +1.1 V. e. +5.0 V.