Using echos to find an object

The sun is sometimes described as an average star. is that true? what is the average star really like?

Round the value 23.731 g to three significant figures. Determine the number of significant figures in the measurement 0.007890 s. Express your answer numerically as an integer.

Which of these processes take place at the same temperature? freezing and condensation melting and sublimation condensation and vaporization sublimation and boiling

A long wire lying along the x-axis carries a current of 3.40 A in the + x direction. There is a uniform magnetic field present, given by B=0.003i + 0.004j + 0.

The force exerted on the small piston of a hydraulic lift is 780 N. If the area of the small piston is 0.0075 m2 and the area of the large piston is 0.13 m2, what is the force exerted by the large piston?

What is the best hypothesis to use for this investigation

Quantum physics would most likely be needed to understand the motion of which of the following? A. an atom B. a cell C. a ball D. a galaxy

Sharon throws a 0.20 Kg with an acceleration of 10 m/s/s. (a) What force did she exert on the ball? (b) What force did the ball exert on her?

What are three ways that extra carbon is getting to the atmosphere?

A girl runs 20.9 m/s East for 13.7s. How far does she go?