Figure P12.17 shows a claw hammer being used to pull a nail out of a horizontal board. The mass of the hammer is . A force of is exerted horizontally as shown, and the nail does not yet move relative to the board. Find (a) the force exerted by the hammer claws on the nail
(a) The force exerted by the hammer claws on the nail will be upward and to the right.
Mass of the hammer
Force exerted horizontally =
Force is physical influence on any material or object that can change the magnitude and direction of the motion of any object. It can be mainly denoted by F.
By the given figure if we will take the single point of contact as P then the exerted force by nail on the hammer claws will be R. The mass of hammer is given that is M = 1.00Kg and the normal force that will be exerted on the hammer at point P be n and the friction acting on it is f.
Then by the moments P,
The Force exerted by the hammer on the nail is equal opposite in direction but equal in the magnitude, so it will be upward and to the right.
The deepest point in the ocean is in the Mariana Trench, about 11 km deep, in the Pacific. The pressure at this depth is huge, about 1.13 3 108 N/m2.
(a) Calculate the change in volume of 1.00 m3 of seawater carried from the surface to this deepest point.
(b) The density of seawater at the surface is 1.03 3 103 kg/m3. Find its density at the bottom.
(c) Explain whether or when it is a good approximation to think of water as incompressible.
One side of a plant shelf is supported by a bracket mounted on a vertical wall by a single screw as shown in Figure P12.55. Ignore the weight of the bracket.
(a) Find the horizontal component of the force that the screw exerts on the bracket when an 80.0 N vertical force is applied as shown.
(b) As your grand-father waters his geraniums, the 80.0-N load force is increasing at the rate 0.150 N/s. At what r ate is the force exerted by the screw changing? Suggestion: Imagine that the bracket is slightly loose.
A stepladder of negligible weight is constructed as shown in Figure P12.56, with A C=B C= . A painter of mass m stands on the ladder a distance d from the bottom. Assuming the floor is frictionless, find
(a) the tension in the horizontal bar D E connecting the two halves of the ladder,
(b) the normal forces at A and B, and
(c) the components of the reaction force at the single hinge C that the left half of the ladder exerts on the right half. Suggestion: Treat the ladder as a single object, but also treat each half of the ladder separately.
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