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- In SI units, speeds are measured in meters per second (m/s). But, depending on where you live, you’re probably mole comfortable of thinking of speeds in terms of either kilometers per hour (km/h) or miles per hour (mi/h). In this problem, you will see that 1 m/s is roughly 4 km/h or 2 mi/h, which is handy to use when developing your physical Intuition. More precisely, show that (a) 1.0m/s=3.6km/h and 1.0m/s=2.2mi/h .The cruising speed of a certain airplane is approximately Mach 0.67, meaning 0.67 times the speed of sound. If the speed of sound at cruising altitude is approximately 295 m/s, what is the cruising speed of an airplane in miles per hour? The cruising speed of an airplane is mph. (Simplify your answer. Round to the nearest integer as needed.)Tectonic plates are large segments of the Earth's crust that move slowly. Suppose one such plate has an average speed of 3.6 cm per year. (a) What distance does it move in 90 seconds at this speed? (b) What is its speed in miles per million years? mi/million yr
- a) A robin flies a distance of 45 963 cm. How far has it flown in kilometres?(b) What is the speed in metres per second of a car that is travelling at 82 km/h? (c) What is the speed in kilometres per hour of a 27.78 m/s baseball pitch?(d) How many seconds are there in a calendar year, given that a calendar year has 365.24 days in it? T/ITectonic plates are large segments of the Earth’s crust thatmove slowly. Suppose that one such plate has an averagespeed of 4.0 cm/year. (a) What distance does it move in 1 s atthis speed? (b) What is its speed in kilometers per millionyears?You get lost and stop at a gas station to ask for directions. The attendant tells you that your destination is "about 1 mile down the road". You drive to your destination, but you notice that, according to your trip odometer, you have driven 1.9 miles. What was the % error in the attendant's distance estimate? ( Note: We will temporarily ignore the sign for error calculations. The correct answer for each calculation is an integerbetween 0 and 100, inclusive. Do NOT enter the percent sign (%) or a minus sign (-). )
- In 2015, the U.S. national debt was about $18 trillion.(a) If payments were made at the rate of $1 000 per second,how many years would it take to pay off the debt, assumingthat no interest were charged? (b) A dollar bill is about 15.5cm long. If 18 trillion dollar bills were laid end to end aroundthe Earth’s equator, how many times would they encirclethe planet? Take the radius of the Earth at the equator to be6 378 km. (Note: Before doing any of these calculations, try toguess at the answers. You may be very surprised.)le diameter of Earth. 3. A person travels by car from one city to another with differ- ent constant speeds between pairs of cities. She drives for 30.0 min at 80.0 km/h, 12.0 min at 100 km/h, and 45.0 min at 40.0 km/h and spends 15.0 min eating lunch and buying gas. (a) Determine the average speed for the trip. (b) Determine the distance between the initial and final cities along the route. 13when electrical appliances whose power usage is x watts is run Y seconds , it uses XXY joules of energy. The energy unit used by electrical utilities in their monthly bills is the kilowatt hour ( Kwh, that is, 1 kilometer used for 1 hour) How much does it cost $0.09 per kilowatt-hour, how much does it cost per megajoules?
- Tectonic plates are large segments of Earth’s crust that move slowly. Suppose one such plate has an average speed of 4.0 cm/yr. (a) What distance does it move in 1.0 s at this speed? (b) What is its speed in kilometers per million years?A high-performance sports car can go from 0 to 100 mph in 7.0 s. (Assume the car travels in the positive direction. Indicate the direction with the sign of your answer.) (a) What is the car's average acceleration (in SI units; meter-kilogram-second)?(b) The same car can come to a complete stop from 31 m/s in 3.9 s. What is its average acceleration?the speed limit on some interstate highway is roughly 100 km/ hour. (a) whatiwhat this in meter per second? (b) what is this in miles per hour?