2017年6月17日 · "North bicycle"=20" "(km)/(hour) "South bicycle"=14" "(km)/(hour) We need to set up equations based on the known information. I always write down everything the question gives me and try to link the information with logic or established formulas. I automatically think of speed=distance/time in this case. Also, units are important, so decide what you want to use and stick with them for all ...

2017年7月17日 · Erin goes off on a long bike ride, averaging 10 km/h. One hour later her brother Alistair starts chasing after her at 16 km/h. How long will it take Alistair to catch up to Erin?

2016年9月25日 · At the equator, 1^oarc length = 111.32 km, nearly. At Baltimore ( latitude = 39.48^o N), this length is 111.16 km, nearly. At the poles, it is 110.95 km, nearly. The equatorial radius of the Earth is 6378.1 km. The difference is 21.3 km. The polar radius is 6366.8 km. At latitude theta^o N/S, the radius is 6378.1-(theta/90)(21.3) km, nearly. An arc of 1 radian = the radial distance of the the ...

2018年6月19日 · Because East and South are at right angles to each other, we can use the distance formula: d = sqrt((3" km")^2+(4" km")^2) d = sqrt(9" km"^2+ 16" km"^2) d = sqrt(25" km"^2) d = 5" km"

2018年5月4日 · "please have a look at the fallowing details." Let's represent the person walking the P point. The horizontal and vertical components of the location vector (red) indicate how many kilometers to walk east and north. "northward=" 3.10*sin(25)=1.31 " "km "eastward =" 3.10*cos(25)=2.81" "km

2015年11月12日 · v=7.70 km.s^(-1) T= 91 min and it will complete 16 orbits per day. For this solution we will make the (reasonable) assumption that the ISS exhibits uniform circular motion. In that case we can use this equation for the speed: v = (2piR)/T where R is the radius of the orbit and T is the period. But two of the variables in that equation are unknowns (v and T). We can use the following equation ...

2017年4月15日 · The average speed of the boat was 31.2(km)/h Speed of the boat is determined using the formula d=rt which equates the distance traveled to the rate (speed) multiplied by the time. d=15.6km t=30.0m=0.5h d=rt (15.6) = r(0.5) (15.6)/(0.5)=r r= 31.2=31.2(km)/h

2017年11月16日 · A farmer wants to wall off his four-sided plot of flat land. He measures the first three sides, shown as A, B, and C in the figure, where A = 4.99 km, B = 2.46 km, and C = 3.23 km and then correctly calculates the length and orientation of the fourth side D. A: What is the length of the vector D in kilometers?

2017年6月20日 · Use dimensional analysis (a.k.a. factor-label method). Given: (x" km")/"h" Multiply by the conversion factor (1000" m")/(1" km"): (xcancel(" km"))/"h"xx(1000" m ...

2016年5月4日 · A plane flying with a constant speed of 4 km/min passes over a ground radar station at an altitude of 13 km and climbs at an angle of 40 degrees. At what rate is the distance from the plane to the radar station increasing 4 minutes later?