Questions in Grade High-school

Questions in Grade High-school

[Done] An 800 kg roller coaster starts from the top of a 45 m hill with a velocity of 4 m/s. The car travels to the bottom, through a loop, and continues up the next hill. The end of the roller coaster has a level surface that is 4 m off the ground. Assume there is no friction on the roller coaster ride and energy is conserved. 1. How tall is the hill if the roller coaster is traveling at 10 m/s at the top of it? 2. What will be the velocity of the roller coaster at the top of the loop?

[Done] Solve for the variable [tex]f[/tex]. \[ 7f + g = 5 \]

[Done] Which of the following is true of the ethnic composition of East Asia? A. North and South Korea have been ethnically distinct for many centuries. B. Japanese peoples are mainly descended from mainland Asian populations. C. The Han Chinese comprise more than 90 percent of China's population. D. About 25 percent of Mongolians are ethnic Kazakhs.

[Done] Solve for \(x\): The product of \(x\) and 7 equals 28.

[Done] Who fitted giant stones together without the use of mortar? A. Aztec B. Maya C. Inca

[Done] Hitler was confident about invading Russia because he had recently captured: A. Spain B. France C. Great Britain D. Switzerland

[Done] Tonya runs 8 kilometers in 60 minutes. At this rate, how long would it take her to run 2 kilometers?

[Done] Why were NATO and the Warsaw Pact formed?

[Done] Solve for \( t \): \[ Rt - 2n = y \]

[Done] How did capitalism encourage colonization and exploration?