Lily rubbed a balloon across her wool sweater. As the balloon is brought near her hair, which of the following effects is most likely? Group of answer choices

Her hair and the balloon will repel each other if neither has any charge.

Her hair will be attracted to the balloon if they have opposite charges.

Her hair will be attracted to the balloon if they have the same charge.

The balloon will lose its charge to her hair, causing them to become very hot.

Calculate the number of molecules present in 0.750 mol of mgo.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *