What is the friction force that acts on the firefighter., Ask an Expert

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Q. A firefighter of mass 115 kg slides down a vertical pole with an acceleration of 4 m/s2. What is the friction force that acts on the firefighter?

Q. Light passes through a 230 lines/mm grating and is observed on a 1.4-{rm m}-wide screen located 1.4 m behind the grating. Three bright fringes are seen on both sides of the central maximum.

Max wavelength and Min wavelength?

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