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In the discovery of penicillin, how did a petri dish full of bacteria change in the presence of bread mold What did Alexander observe, and what caused?
Once penicillin was isolated from bread mold and manufactured as a therapy for bacterial infection?
State the relationship between polarization current density and electric field intensity. How is it taken into account in Maxwell's equations? What is the revised definition of D?
For a random variable that is normally distributed, with μ = 80 and μ = 10, determine the probability that a simple random sample of 25 items will have a mean that isa. greater than 78.b. between 79 and 85.c. less than 85.
A 0.045kg ball is propelled by a 2.15kg racquet from rest to a speed of 50.0m/s. If the two objects are in contact for 220ms, calculate the average force exerted by the racquet on the ball
A 1.5 kg copper block is given an initial speed of 3 m/s on a rough horizontal surface. Because of friction, the block finally comes to test. If the block absorbs 85% of its kinetic energy, calculate its increase in temperature.
Illustrate what is the magnitude of the change in momentum of the ball while in contact with the bat if the ball leaves with a velocity of (a) 18 m/s, vertically downward, and (b) 18 m/s, horizontally back toward the pitcher?
An attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s from a height of 1.55 m above the ground. Will the rock reach the top of the wall
Three identical resistors are connected in series. What power would be dissipated if the three resistors were connected in parallel across the same potential difference
A 10.0 g piece of clay is launched horizontally at 108-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 148 N/m
If a truck generates 15 hp when travelingat a steady 92 km/h, what must be theaverage force exerted on the truck due to friction and air resistance
two circular current loops are located at z r2 and z -r2 parallel to the xy-plane and centered at the z-axis. each
a 120 g ball attached to a spring with spring constant 2.9 nm oscillates horizontally on a frictionless table. its
A ball is thrown with a velocity of 11.94 m/s at an angle of 43 degrees with the horizontal from an initial height of 1.76 m above the ground. Find the maximum height of the ball
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