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Q1. A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 56° above the horizontal. The weight of the ladder is 35 pounds. A 77 lb boy climbs 6.0 ft up the ladder. What is the magnitude of the friction force exerted on the ladder by floor?

Q2. A quantum simple harmonic oscillator consists of an electron bound by the restoring force proportional to its position relative to the certain equilibrium point. The proportionality constant is 8.59 N/m. What is the longest wavelength of light that can excite oscillator?

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