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A 2.5-m long board with a mass of 12 kg is placed on a bar so that it is perfectly balanced, i.e., the bar exactly underearth the middle of the plank:
a. A 22-kg child sits on the left end of the board. What is the torque they exert on the system?
b. A second child with a mass of 27 kg sits on the other side. How far away from the center must the second child be if the board is to remain in equilibrium?
c. Suppose the second child sits on the opposites end of the board. What is he net torque acting on the system?
d. What is the moment of inertia of the board? If we each child as a point mass, what is the total moment of inertia of thesystem?
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A 16 kg wood ball hangs from a 2 m-long wire. The maximum tension the wire can withstand without breaking is 435 N. A 1.2 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the largest speed the projectile can ha..
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A highway curve of radius 500 m is designed for traffic moving at a speed of 73 km/hr. What is the correct banking angle of the road.
Suppose you walk 3.97 m down a 30° incline while holding a 1.05 kg block. The 3.97 m distance is measured as a displacement along the incline; not as a vertical change in height. How much work do you do on the block as you walk down the incline.
A movie camera has a converging lens with a focal length of 80.0 mm. What is the height of the image on the film
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A camera has a lens with a focal length of 25.6 cm. how far from the film should the lens be placed
The specific heat of a 100-g block of a substance is to be determined.The block is placed in a 25-g copper calorimeter holding 60 g of water at 20°C. Determine the specific heat of the block
A Force F= (6xi+ 5yj), where F is in newtons and x and y are in meters, acts on an object as the object moves in the x direction, Find the work W = integral (F · d vector r) done by the force on the object
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