Reflecting telescopes are popular because they're

A. more powerful than a refracting telescope.

B. smaller than a refracting telescope.

C. easier to build than a refracting telescope.

D. more durable than a refracting telescope.

What can you tell about the hydrogen/hydroxide ion concentration of the unknown liquid

What is an electric field? (choose all that are true) a) A vector field created by a charged particle. b) The field created when one charged particle is brought close to another charged particle. c) A scalar field created by a charged particle.

An airliner lands with a speed of 47.0 m/s. Each wheel of the plane has a radius of1.25 m and a moment of inertia of 110kgm2. Attouchdown the wheels begin to spin under the action of friction. Each wheel supports a weight of 1.

What are the tool needed to find the density of an irregularly shaped object?

Which of the following is an inclined plane? - Stairs - Wheelchair ramp - Sloping driveway - Road going up a mountain

A tube, open at only one end, is cut into two shorter (nonequal) lengths. The piece that is open at both ends has a fundamental frequency of 422 Hz, while the piece open only at one end has a fundamental frequency of 666 Hz.

Table tennis the path of a table-tennis ball after being hit and hitting the surface of the table can be modeled by the function h=-4.9t (t-0.42) where h is the height in meters above the table and t is the time in seconds.

A coat rack weighs 65.0 lbs when it is filled with winter coats and 40.0 lbs when it is empty. The base of the coat rack has an area of 452.4 in2.

An initially stationary object experiences an acceleration of 6 m/s2 for a time of 15 s. How far will it travel during that time?

How was helium first discovered? mining of the radioactive element uranium using spectral analysis of the Suns' emission spectra o hubble obtaining samples from explosions off the surface of the sun deep sea mining off the coast of Texas