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It takes 20 turns to drive a screw completely into a block of wood. Because the friction force among the wood and the screw is proportional to the contact area among the wood and screw, the torque required for turning the screw increases linearly by the depth the screw has penetrated into the wood. If the maximum torque is 12 Nm when the screw is completely in the wood, what is the total work in Jolues needed to drive the screw?
find capacitance of a paraell-plate capacitor with area 34_cm^2, seperation distance 0.72_mm an dielectric with constant 2.5. use 8.85 x 10^-12 C^2/N*m^2
an ammonia molecule nh3 has a permanent electric dipole moment 5.0 10-30 cm. a proton is 1.8nm from the molecule in
The masses and coordinates of three spheres are as follows: 14 kg, x = 1.25 m, y = 1.25 m; 38 kg, x = -2.50 m, y = -2.00 m; 62 kg, x = 0.00 m, y= -0.50 m. What is the magnitude of the gravitational force
A 62.00kg student is standing atop a spring in an elevator that is accelerating upward at 3.8 m/s2. The spring constant is 2600-N/m. By how much is the spring compressed.
The clarinet is well modeled as a cylindrical pipe that is open at one end and close at the other. Find the wavelength and frequency of the third normal mode of vibration of a clarinet's air column
A uniformly charged conducting sphere of 1.4 m diameter has a surface charge density of 11 µC/m2, Find the net charge in coulombs on the sphere
Young's modulus of nylon is 3.7 × 109 N/m2. A force of 6.0 × 105 N is applied to a 1.5-m length of nylon of cross sectional area 0.25 m squared
The escape velocity of a bullet from the surface of planet Y is 1727 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.490 times that of Y, and its radius is 0.8790 times the radius of Y (in m/s).
At a tea party, a coffeepot and a teapot are placed upon the serving table. The coffeepot is a shiny silver-plated pot with emissivity of 0.30; the teapot is ceramic and has an emissivity of 0.55. what is the rate of radiative heat loss from the tw..
A uniform rod of mass M and length L is sitting vertically with one end resting on a frictionless surface, perfectly balanced. Find the angular velocity of rod just as it hits the ground
one end of a meter stick is pinned to a table so the stick can rotate freely in a plane parallel to the tabletop. two
A swimmer heads directly across a river, swimming at 1.9 m/s relative to the water. She arrives at a point 34 m downstream from point directly across the river, which is 80 m wide.
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