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1. If the wind becomes strong enough, it is "impossible" to paddle a canoe into the wind. Estimate the wind speed at which this will happen. List all assumptions and show all calculations.
2. A fishnet consists of 0.10-in.-diameter strings tied into squares 4 in. per side. Estimate the force needed to tow a 15-ft by 30-ft section of this net through seawater at 5 ft/s.
A 78.0kg skydiver can be modeled as a rectangular "box" with dimensions 21.0cm × 41.0cm × 185cm. What is his terminal speed if he falls feet first
A system does 4.30 104 J of work, and 7.00 104 J of heat flows into the system during the process. Find the change in the internal energy of the system
A thin gold ring of radius 1.11 cm carries a uniform charge per unit length of 1.1e-14 C/m. Find the electric field on the axis of the ring
A particle with a charge of 4.10 x 10-3 C is moving in the presence of an electric field of 798 N/C. Find what force does the particle experience
What is the energy of a photon with frequency of 4x1014Hz? h=6.6x10-34J.s
1. Describe the forms of porosity that exist in "killed steel" and "semi-killed steel". 2. Why does preheating and postheating reduce the amount of hydrogen left in a weld?
A contact lens is made of plastic with an index of refraction 1.38. The lens has an inner radius of curvature of +2.46 cm and an outer radius of curvature of +2.08 cm. What is the focal point of the lens?
Calculate the energy of the electron in the ground state of triple ionized beryllium, which has an atomic number Z = 4
Find out the angle the string makes with the vertical.what is the maximum voltage that can be applied across the whole network.
A dolphin swims near the sea surface 350 meter west, then 200 meter northwest, and then dives below the surface and swims an additional distance in an unknown direction. Obtain the dolphin displacement during the dive
A race car starts from rest on a circular track of radius 490 m. The car's speed increases at the constant rate of 0.740m/s2. find the speed of the race car
the electron-volt ev is a unit of energy 1ev 1.602 middot10-19 j 1 mev 1.602 middot10-13 j.since the unit of momentum
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