(a) How long does it take a radio signal to travel140 km from a transmitter to a receiving antenna?

(d) The Crab nebula, which is about 6500 light-years (ly) distant, is thought to be the result of a supernova explosion recorded by Chinese astronomers in A.D. 1054. In approximately what year did the explosion actually occur?

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Account Titles Debit Credit Accounts receivable 11,600 Prepaid insurance Service trucks Accumulated depreciation Other assets Accounts payable Wages payable Income taxes payable Note payable (3 Common stock (5,000 shares outstanding) Additional paid-in capital Retained earnings Service revenue 19,000 9.200 8,300 3,000 ; 10% interest due each December 31) 17,000 19,000 6,000 61360 (not detailed; excludes income tax) 33,360 Income tax expense 115,960 115,960 Account Titles Debit Credit Accounts receivable 11,600 Prepaid insurance Service trucks Accumulated depreciation Other assets Accounts payable Wages payable Income taxes payable Note payable (3 Common stock (5,000 shares outstanding) Additional paid-in capital Retained earnings Service revenue 19,000 9.200 8,300 3,000 ; 10% interest due each December 31) 17,000 19,000 6,000 61360 (not detailed; excludes income tax) 33,360 Income tax expense 115,960 115,960