A50 kg ice skater is gliding along the ice, heading due north at 4.0 m/s. the ice has a small coefficient of static friction, to prevent the skater from slipping sideways, but mk = 0. suddenly, a wind from the northeast exerts a force of 4.0 n on the skater.

a.) use work and energy to find the skater’s speed after gliding 100 m in this wind.

b.)what is the minimum value of ms that allows her to continue moving straight north?

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

What is the measurement of how fast an object moves relative to a reference point?

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.