What are the signs of the angular velocity ω and angular acceleration α of the pulley in case (a)? by convention, clockwise rotations are negative and counterclockwise rotations are positive. what are the signs of the angular velocity and angular acceleration of the pulley in case (a)? by convention, clockwise rotations are negative and counterclockwise rotations are positive. ω> 0, α> 0 ω< 0, α> 0 ω> 0, α< 0 ω< 0, α< 0

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.