Calculate the centripetal force exerted on the earth by the sun. assume that the period of revolution for the earth is 365.25 days, the average distance is 1.5 × 10^8 km and the earth’s mass is 6 × 10^24 kg. the choices are: 1. 3.56775 × 10^22 n 2. 2.66331 × 10^32 n 3. 7.24562 × 10^22 n 4. 1.62932 × 10^21 n5. none of these 6. 3.56775 × 10^19 n 7. 4.6238 × 10^29 n 8. 1.28439 × 10^26 n 9. 7.24562 × 10^20 n

An astronomer at the equator measures the doppler shift of sunlight at sunset. from this, she calculates that earth’s tangential velocity at the equator is 465 m/s. the centripetal acceleration at the equator is 3.41  10 2 m/s 2 . use this data to calculate earth’s radius.

The precision of a laboratory instrument is ± 0.05 g. the accepted value for your measurement is 7.92 g. which measurements are in the accepted range? check all that apply. 7.85 g 7.89 g 7.91 g 7.97 g 7.99 g

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.