Which is an example of sliding friction?

A. a car's wheels rolling down the road

B. a bird flying through the air

C. a child applying the brakes on his bike

D. a bowling ball rolling down a lane

Which of the following represents the brightness of a celestial object measured from Earth? Absolute brightness Apparent magnitude Luminosity Proto-star

The Balmer series is formed by electron transitions in hydrogen that a. begin on the n = 1 shell. b. end on the n = 2 shell. c. end on the n = 1 shell. d. are between the n = 1 and n = 3 shells. e. begin on the n = 2 shell.

Using the definition of the scalar product, find the angle between the following vectors. (Find the smallest angle.) a) A = 5i - 9j and B = 5i - 5j (b) A = - 8i + 5j and B = 3i - 4j + 2k (c) A = - 2i + 2j and B = 3j + 4k

All of the following are possible source of error in a scientific investigation except for? A) Discovering new variables as the experiment proceeds B) Not controlling all the variables in a experiment C) Adding research resources during an

As the frequency of a wave increases what happens to its period and wavelength if its speed stays the same

A person lifts a 4.5 kg cement block a vertical distance of 1.2 m and then carries the block horizontal - ly a distance of 7.3 m. determine the work done by the person and by the force of gravity in this process.

A tree is standing in the middle of a meadow. As you watch, the wind begins to blow and the tree bends. Which statement best explains how you could tell that a net force was acting on the tree? OA) The tree had momentum.

A 5.1 kg black bear cub weighs 49.98 N. The cub is carried by its mother up into the safety of a white pine tree.

Which location is associated with persistent upwelling of cold water to the ocean surface?

What type of electromagnetic radiation is associated with the peaks in this spectrum chem 237?