Which of the following is true for electromagnetic waves? They require a medium for propagation. They are longitudinal waves. They have different speeds in vacuum for different frequencies. They are transverse waves.

1) The height of the Washington Monument is measured to be 170 m on a day when the temperature is $35.0^{\circ }C$ What will its height be on a day when the temperature falls to $-10.0^{\circ }C$ Although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble's.

A point is subjected to 5 ksi biaxial tension. The diameter of the corresponding Mohr's circle is most nearly: O 5 ksi 7.07 ksi 10 ksi

A ball is thrown vertically upward. After r seconds, it's height him feet) is given by the function $h(t)=40t-16t^{2}$ After how long will It reach its maximum height? Do not round your answer. Time: $\square $ seconds

The __ hypothesis states that the moon and the earth originally formed close to each other from the same material, cooling and solidifying separately. Answer Input: Spelling counts but capitalization doesn't. $\square $

Sound propagates through a soft-tissue medium and strikes another soft tissue.What is the approximate amount of transmission at this interference? A $100\% $ B $99\% $ B C $1\% $ D $50\% $

If the power of a wave is increased by a factor of 10, what happens to the intensity of the wave? A It remains unchanged B It increases by a factor of 10 C It decreases by a factor of 10 D It increases by a factor of 100

Topic: Second Law of Thermodynamics More efficient gasoline engines could be built if they could withstand lower temperatures. greater rotational rates. none of the available options higher temperatures.

4. What is the structural classification of the Milky Way galaxy? A. Elliptical galaxy B. Barred spiral galaxy C. Irregular galaxy

Select the choice that best completes the following statement. Current measurement is started at the highest range to give: a) An accurate reading b) A minimum resistance c) A maximum range d) A maximum protection to the meter

The rings of Saturn have their structure due to which of the following? A Resonance with Saturns moons. B Shepherding moons within the rings. C New material added often to the rings. D All of the above E None of the above