Where should he place a block of wood to act as the fulcrum
A steel rod 2.00 m long is to be used to pry up one end of a 400-kg crate. If a workman can exert a downward force of 400 N on one end of the rod, where should he place a block of wood to act as the fulcrum?
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A survey provided the estimate that the mean number of hours of television viewing per household is 7.25 hours per day. Assume that the survey involved 200 hoouseholds and that the sample standard deviation was 2.5 hours per day.
A researcher hypothesizes that people who listen to classical music have higher concentration skills than those in the general population. On a standard concentration test, the overall mean is 15.5. The researcher gave this same test to a random s
The radius of a solid sphere is measured to be (6.50+-0.20) cm, and its mass is measured to be (1.85+-0.02) kg. Determine the density of the sphere in kilograms per cubic meter and the uncertainty in the density.
Draw a diagram of the same problem above. if the bullet passes through the wood and continues at 100 m/s east, what is the velocity of the block of wood?
Two powerless rockets are on a collision course. Rocket 1 is movingat 0.800c relative to Liz, an Earth observer. Rocket 2 is moving at-0.600 c relative to Liz. The two rockets are initially 2.52 x102 m apart and both are 50.0 m in length, as measu
The charge per unit length along the semicircle is described by the expression lambda = lambda0cosθ. The total charge on the semicircle is 13.7 µC. Calculate the total force on a charge of 2.82 µC placed at the center of curvatur
A hospital patient has been given 131I (half life= 8.04 days) which decays at 4.5 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptable level? Assume that the material merely decays a
Determine the mass flow rate through the duct if the reciever pressure is A.) 10 psia, B.) 5 psia. Sketch temperature-entropy diagrams for situations A and B.
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