What do you think that astronomers mean when they use the term observable universe? (Hint: Thi. nk of the time it takes for light from very distant objects to reach Earth.)

How long will a trip take in hours of you travel 450kmat an average speed of 80 km/hr

True or false, only a radioactive isotope will have a half-life

1. Find the velocity of a turtle who swims 100 meters toward the shore in 25 seconds.

13. Which best summarizes the change in number and size of microcontinents during the Proterozoic? a. the number of microcontinents increased and the size increased b. the number of microcontinents increased and the size decreased c.

Bjorn is holding a tennis ball outside a second floor window (3.5 meters from the ground) and billie jean is holding one outside a third floor window (6.

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