An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 493 Hz when the train is approaching him and 476 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find

Sasha has just gotten a new job in a nearby city. after comparison shopping, she found that renting a nice two-bedroom apartment would cost around $800 per month. her utilities would cost about $150 per month. sasha has enough money saved for a down payment, and she found that she can buy a three-bedroom house or condo with a mortgage payment of $1,000 per month, including taxes and homeowner's insurance. her utilities would cost about $200 per month. what is the advantage of buying the house over renting the apartment?