When you speak or sing, you force air through your?

A woman starts to swim directly across a 5.2-km-wide river. Her speed with respect to the water is 1.9 m/s. The river current carries the woman downstream at a speed of 0.91 m/s.

The elements most likely to form more than one type of ion are the transition metals alkali metals halogens alkaline earth metals

A moving object can be in equilibrium. Explain.

Greg is boiling water on the stove for some noodles. what object can he safely hold while draining the water from the noodles after they are cooked?

Which term describes the bending of a wave as it travels into a different medium? A. Reflection B. Interference C. Diffraction D. Refraction

A wave has a wavelength of 50 m and a speed of 200 m/s. What is the frequency of this wave in hertz?

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

Which of the following best describes the earth's average surface temperature for the past 900,000 years? A. a steady warming trend B. fairly steady temperatures until recently C. prolonged periods of cooling and warming D.

A capacitor with initial charge q0 is discharged through a resistor. What multiple of the time constant τ gives the time the capacitor takes to lose (a) the first 1/8-th of its charge (b) 7/8-th of its charge?

A sheet of paper has a mass of 5 grams. The paper is dropped from a high building twice (it reaches terminal speed in both cases), once as a flat paper of area 600 cm2 and once crumpled as a ball of radius 2 cm.