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Calculating the net Force As shown in Figure 5-3, two forces act on a body. One force acts to the right with magnitude 1100 N, while the other force is to the left with a magnitude of 700 N. Find the net force acting on the object.
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Nuclear Physics
Cub Pushing Mom A polar bear cub and his mother are standing still on a frictionless icy patch in the Gulf of Boothia, Nunavut. The 50.0 kg cub pushes the 400. kg mother bear with a constant (while in contact) force. What happens to the cub?
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Nuclear Physics
Braking Distance A 125 tonne subway train is brought to a stop from a speed of 23.0 m/s using a constant braking force of 425 kN. Over what distance does the train come to a stop? Assume that the only force stopping the train is the constant braking force.
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Nuclear Physics
Motion on a Frictionless Incline A box is free to slide on a frictionless surface. The surface is inclined at an angle θ above the horizontal. Derive an expression for the acceleration of the mass, and calculate the magnitude of the normal force exerted by the inclined surface on the mass.
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Nuclear Physics
Gravitational Force on a Distant Planet On a distant planet (without an atmosphere), it is observed that when a 0.250 kg object is dropped from rest, its speed after 1.0 s is 6.0 m/s, and after 3.0 s it is 18.0 m/s. What must be the gravitational force on the mass?
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Nuclear Physics
Blood Flow through a Blocked Artery Arteriosclerosis, the most common type of cardiovascular disease, is caused by the buildup of cholesterol plaque in an arterial wall resulting in narrowing (called stenosis) of an artery. It is the major cause of heart attack and stroke. An 80% blockage of an artery is considered serious and can lead to collapse of that artery under external pressure, a consequence of Bernoulli’s equation. This example discusses blood flow through a horizontal artery that is partially blocked. The flow is assumed to be ideal. Consider blood (density 1060 kg/m3) flow through a horizontal artery that is 80% blocked along a certain section (Figure 12-42). The cross-sectional area of the healthy (i.e., unblocked) part of the artery is 1.0 cm2, and the speed of blood through this section is 〖1.0 cm〗^2. Determine the pressure drop in the blood as it passes through the blocked section of the artery.
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Nuclear Physics
Calculating Pressure A 0.500 kg book is resting on a table. Its cover has a surface area of 0.060 m2. You push down on the book with your hand with a force of magnitude 50.0 N, with your arm inclined at an angle of 40.0° with respect to the normal to the book’s surface (Figure 12-6). The area of your hand in contact with the book, A_hand,is 0.012m^2. Find the pressure exerted by your hand on the book. What is the pressure exerted on the table by the book when your hand is pressing on the book?
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Nuclear Physics
Hydraulic Car Jack A hydraulic car jack has an output cylinder 30.0 cm in diameter and an input cylinder 5.00 cm in diameter and is filled with oil of density 900 kg/m3. An automobile of mass 1100 kg needs to be elevated 40.0 cm. (a) How far does the piston of the input cylinder need to move? (b) What is the magnitude of the force on the input piston required to keep the car elevated?
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Nuclear Physics
