8. The velocity of a car reduces from 30 km/h to 5 km/h as the car approaches a stop sign. Is this an example of positive or negative acceleration? (circle the correct answer)

A pipe of length 4 m open at one end resonates with the 11th harmonic of a frequency. What is the wavelength of the frequency?

When asked how to create an electromagnet the best answer would be?

A centrifuge is a commonly used tool in laboratory research. It uses forces experienced during rapid rotation to separate substances in liquid or solid media according to particle size and density differences.

An object has an x-momentum of 8.5 kilogram·meters/second and a y-momentum of 9.8 kilogram·meters/second. What is resultant momentum of the object?

How are nuclear reactions used to meet the world's energy needs?

Light incident on a surface at an angle of 45 degrees undergoes diffused reflection. At what angle will it reflect?

A ship on the surface of the ocean receives a sonar echo back from an underwater object. The echo path from the object to the ship is at an angle of 35 degrees above the horizontal and takes 3s to return. (Velocity of sound in sea water = 1500m/s).

A wave has a speed of 6 m/s and a wavelength of 12 m. What is the frequency of this wave? a. 2.0 Hz b. 0.5 Hz c. 18 Hz d. 72 Hz

What is the acceleration of a body revolving in a circle at uniform speed? A. The acceleration is zero. B. The acceleration is directed tangentially. C. The acceleration is directed toward the center. D.

What volume is occupied by 2.35 moles of he at 25 degree c and a pressure of 0.980 atm?