Is centripetal acceleration always positive?

Explain the difference between a fluorescence emission spectrum and a fluorescence excitation spectrum. which more closely resembles an absorption spectrum?

Radio communications were severely disturbed last week, and the local newspaper says that solar activity is to blame. which types of solar activity could the newspaper be talking about?

Which of the following statements best defines the term operon? An operon is a region of DNA that consists of a single gene regulated by more than one promoter. An operon is a region of RNA that consists of the coding regions of more than one gene.

If a 100n net force acts on a 50 kg car what will the acceleration of the car be

If you went to a planet with an acceleration due to gravity of 20 m/s^2 and twirled a bucket of water, what happens to the angular speed you need to twirl the bucket to keep the water in?

After creating a question and forming a hypothesis, what is the next step in the scientific method

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.51 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Which statements accurately describe the Doppler effect?

Describe how mass and distance affect gravitational force.

a bike can climb the inclined road at uniform speed of 72 km/hr by applying force 500N what will be the power applied by the bike?