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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?
A house has a floor area of 115 m2 and an outside wall that has an area of 24 m2. The earth's magnetic field here has a horizontal component of 2.50 e 10-5 T that points due north and a vertical component of 4.30 e 10-5 T that points straight down..
A beam of nuclei is used for cancer therapy. Each nucleus has an energy of 181 MeV, How many nuclei are in the beam
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A monatomic ideal gas in a rigid container is heated from 222 K to 304 K by adding 8560 J of heat
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a car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is traveling due west at 20 m/s. find the direction of the car's average acceleration
A 62kg hiker starts at an elevation of 1500m and climbs to the top of a 3500m peak, What is the minimum work required of the hiker
A light source emits two spectral lines: one at 473 nm and one at 722 nm. what is the distance between the two spectral lines in the first order spectrum
A 6.5×10-25-kg particle is vibrating with simple harmonic motion with a period of 5.0×10-6 s and a maximum speed of 6.00×102 m/s. Find the Maximum displacement of the particle.
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