A49.0 kg ice skater is gliding along the ice, heading due north at 4.40 m/s . the ice has a small coefficient of static friction, to prevent the skater from slipping sideways, but μk =0. suddenly, a wind from the northeast exerts a force of 3.50 n on the skater. part a use work and energy to find the skater's speed after gliding 100 m in this wind. express your answer with the appropriate units.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?