15. For waves moving at a constant speed, if the wavelength is doubled, the frequency is

doubled

halved

unchanged

quadrupled

A toy car on a string is pulled across a table horizontally. The string is at an angle of 30°. Which is the correct free-body diagram for this situation?

A mover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. What was the change in the pianos energy? a. 20j b. 200j c. 2000j d. 20000

The government has declared that a hurricane is likely to hit the East Coast. Which government division is part of ACF and provides guidance to citizens? A. Job Opportunities for Low-Income Individuals B.

What is a constant variable?

A girl kicks a soccer ball. It goes 10 feet and comes back to her. How is this possible?

Consider two air-filled parallel-plate capacitors with circular plates. Capacitor 1 has a distance between plates d and plate radius R. Capacitor 2 has a distance between plates 2d and plate radius R/2.

Which of the following would not increase the velocity of a sound wave in air? A. increasing the temperature of the air. B. lowering the density of the air. C. lowering the humidity of the air. D.

Is minerals can be solids or liquids

If our planet was without its ocean but otherwise the same as it is today, would surface temperatures be more extreme than they are now (that is, higher high temperatures in summer and lower low temperatures in winter), of less extreme, or what?

A (n) ___ forms where light seems to come from.