A helicopter flies 250 km on a straight path in a direction 60° south of east. The east component of the helicopter's displacement is

A rolling ball moves from x1 = 3.4cm to x2 = - 4.2cm during the time from t1 = 2.0s to t2 = 6.1s. What is its average velocity?

Which is the correct definition of a chemical reaction? A. Substances are mixed together. B. Substances interact to form new substances. C. Things change color. D. Substances melt.

Which statement best describes what energy transfer diagrams show? Energy can change form, but the total amount of energy stays the same.

Which type of pollution occurs when small particles of soil are suspended in water?

A wave has a wavelength of 12 mm and a frequency of 7 hertz. What is its speed?

What type of simple machine is a hand drill? A) pulley B) wedge C) ramp D) screw

Calculate the wavelength and frequency of the radiation emitted by the electronic transition from the 10th to the 9th excited state of hydrogen.

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L

What kind of tide is responsible for extreme tides

What does the speed of sound depend on? A. Medium that the sound travels through B. Acoustics C. Frequency of the sound D. Loudness of the sound