Why does the speed of sound vary depending on the medium through which it travels. in general?

Let at time t1 means?

Which statement correctly describes mass-energy equivalence?

The gravitational acceleration on Earth is 9.8 m/s2. A small marble is dropped to the floor, assume that as the marble falls, the only force exerted on the marble is the force of gravity (there is no air resistance).

One proven risk of GM crop is? a. the escape of GM genes into non-GM crops. b. the risk of cancer associated with eating GM food. c. increased resistance of insects to pesticides because of the pesticides resistance of GM crops. d.

Match each term with its definition. Morpheme Phoneme Grammar Syntax 1) smallest units of sound that carry meaning on their own 2) smallest units of sound that make a difference in meaning 3) combined set of rules that govern use of a particular

Do you think an observer on another planet in the solar system might see eclipses

A. A vector is any element of a vector space. Is this statement true or false? A. True by the definition of a vector space B. False; not all vectors are elements of a vector space. C. False; a vector space is any element of a vector.

19 Which gas is the most abundant greenhouse gas? A. ozone B. chlorofluorocarbon C. carbon dioxide OD. methane E. water vapor Reset Next

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pushed together, without touching. How is the amount of charge on the plates affected during this process? a.

Which of the following creates a longitudinal wave? A. striking a gong B. turning on a flashlight C. shaking a rope up and down D. dropping a stone into a pond