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A beam of red laser light (? = 633 nm) hits a black wall andis fully absorbed. If this exerts a total force of F = 5.5 nNon the wall, how many photons per second are hitting the wall?
Suppose that the proper half life of a certain type of particle is 1.8μs. How many particles would be detected in one hour at the other end of the pipe
A car rounds a 1.15 radius circular track at 82 Find the magnitude of the car's average acceleration
You are the technical consultant for an action-adventure film in which a stunt calls for the hero to drop off a 23.7-m tall building and land on the ground safely at a final vertical speed of 3.85 m/s. How many revolutions does the drum make during..
A playground Merry-Go-Round has a mass of 291 kg which can be viewed as being uniformly distributed over a disk of radius 2.4 m. What is the new rotation rate assuming the child remains at the rim
An object weighing 335 N in air is immersed in water after being tied to a string connected to a balance. Find the density of the oil
a carpenter has been asked to build an open box with a square base. the sides of the box will cost 4 per square meter
Suppose that the hail comes straight down at a mass rate of m/?t = 0.030 kg/s and an initial velocity of v0 = -10 m/s, calculated the force exerted by the hail on the roof
A 70 ohm lamp and a 75 ohm lamp are connected in series and placed across a potential of 41 V. What is the equivalent resistance of the circuit
White light containing wavelengths from 400 nm to 750 nm falls on a grating with 7000 lines/cm. How wide is the first-order spectrum on a screen 2.10 m away.
A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. What is the length of the rotating string in meters
Your friend's car runs out of fuel and you volunteer to push it to the nearest gas station. what is the contact force between the two bumpers
A car of mass M = 1200 kg traveling at 45.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires.
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