Question
What is the minimum escape velocity of rocket to be
launched into space?Solution
On the surface of the Earth, the escape velocity is about 11.2 kilometers per second 06.96 mi/s), which is approximately 34 times the speedof sound(Mach34) andseveral timesthemuzzlevelocity ofarifle bullet (up to 1.7 km/s). However, at 9,000 km altitude in "space", it is slightly less than 7.1 km/s. In physics,escapevelocityisthespeedatwhichthe kinetic energy plus the gravitational potential energy of an object is zero.
Which of the following fractions is the largest?
A man distributed some candies to his three sons A, B and C. A, being the eldest got two times the number of candies that C got while A and B together...
12.5% of 96 =?
The value of
- The product of two decimals is 0.675. If one of the decimals is 2.5, then find the other decimal.
Express 7/16 as a decimal correct to three decimal places.
A rope is 20 m long. A person uses 3/5 of it and then cuts off 1/4 of the remaining part. How many metres of rope are left?
Evaluate: 4.8 × 2.5 + 9.6 ÷ 0.4
2/5 of a number plus 3/10 of the same number is 70. Find the number.
If the sum of 60% of a fractional number and the number's square root is 5 greater than one fifth of the number, then the number is
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