Question
A man inside an artificial satellite feels
weightlessness because the force of attraction due to earth is –Solution
Earth attracts all bodies towards its centre. The acceleration produced in the body due to attraction force of earth on it is called the acceleration due to gravity. A astronaut in a satellite experiences weightlessness because two forces act on him: gravitational pull and centrifugal force which cancel out each other with the resultant force acting on him being zero.
A man can row a boat in still water at a speed of 8 km/h. He rows downstream for 1 hour and then returns upstream. If the total time taken for the entir...
- What is the term for restarting a computer that is already powered on?
{14.13 x 28.84 - 39.95% of 420.09 + 128.89} = ?
A coin is tossed. If head occurs, a ball is drawn from a bag containing 3 red and 4 green balls. If tail occurs, a die is thrown. The probability that t...
If a, b, c are in GP, then which of the following is always true ?
Solve the quadratic equations and determine the relation between x and y:Â
Equation 1: x² + 2x - 15 = 0
Equation 2: y² - 4y - 12 = 0
A man observes the top of a tower at an angle of elevation of 45°. He walks 50 meters towards the tower, and the angle of elevation becomes 60°. What ...
Simplify: (1 + i)³ / (1 + i³)
Let sinA+ sinB = a and cosA+ cosB = b, then the value of a² + b² = ?
A particular sum of money, when invested at a simple interest rate, yields Rs. 3,000 as interest after 2 years. The same sum, whe...
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