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1. A 220-cm-square sign is impacted straight on by a 50 m=s 10-C wind. Estimate the force on the sign. If the sign is held by a single 3-m-high post imbedded in concrete, what moment would exist at the base of the post? 2. A 20-cm-diameter smooth sphere is rigged with a strain gauge calibrated to measure the force on the sphere. Estimate the wind speed in 20-C air if the gauge measures (a) 4 N and (b) 0.5 N.
A contact lens is made of plastic by an index of refraction of 1.60. The lens has an outer radius of curvature of +2.07 cm and an inner radius of curvature of+2.56 cm. What is the focal length of the lens?
A 2.9 MeV (kinetic energy) proton enters a 0.38 T field, in a plane perpendicular to the field. Evaluate what is the radius of its path
An unknown mass of tin is heated to a temperature of 218 C. It is placed into 200 g of water which is in a 100 g copper cup initially at 10 C. What is the heat lost by the sample of tin
A uniform plank of length 2m and mass 10kg is supported at each end. If a 75kg person stands 0.5m from the left end of the plank, find the force exerted on the plank by each support
A shell is shot with an initial velocity of 17 m/s, at an angle of ?0 = 60° with the horizontal. How far from the gun does the other fragment land
you throw a ball m 2kg from the top of a 30 m cliff with a initial velocity of 25 ms at an angle of 50 degrees. a
The Saturn's ring has a diameter of about 2.00x10^5km and the distance between the Earth and the Saturn is 1.40x10^9km. Based on your calculation on resolution power, will the ring be visible in telescope.
a piano tuner stretches a steel piano wire with a tension of 765n . the steel wire has a length of 0.500m and a mass of
A sled is dragged along a horizontal path at a constant speed of v = 1.52 m/s by a rope that is inclined at an angle of ? = 30.3° with respect to the horizontal
An open tank is filled with gasoline to a height of 4.5 m from the bottom. A hole of diameter 2.4cm is at the bottom of the tank. How fast is the seepage? How many cubic meters of gasoline is wasted per second?
A certain atom of has 89 protons. Assume that the nucleus is a sphere with radius 7.25 fm and with the charge of the protons uniformly spread through the sphere. At the nucleus surface what is the magnitude of the electric field produced by the pr..
an electric field varies in space according to this equation ex a x e-bx where a 1.353 ncm-1 and b 0.847 m-1.a for
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