A man of mass 50kg ascends a flight of stairs 5m high in ...
A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms-2, the power expended is?
100W
200W
250W
400W
500W
Correct answer is E
Power = \(\frac{\text{force x distance}}{\text{time}}\)
= \(\frac{50 × 10 × 5}{5}\)= 500W
Which of the following statements is correct about volatile liquids? They have ...
The phenomenon that makes sound persist when its source has been removed is known as ...
The inner diameter of a small test tube can be measured accurately using a ...