A rocket is fired upward from the earth surface such that it creates an acceleration of 19.6 m/s².If after 5s, its engine is switched off, the maximum height of the rocket from earth ‘s surface […]
A boat taken 2h to travel 8km and back in still water. If the velocity of water 4 km/h,the time for going up stream 8 km and coming back is
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(a) 2 […]
A projectile is thrown in the upward direction making an angle of 60°with the horizontal direction with a velocity of 147 m/s.Then, the time after which it’s inclination with the horizontal is 45°,is
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The horizontal range and maximum height attained by a projectile are R and H,respectively.If a constant horizontal acceleration a=g/4 is imparted to the projectile due to wind,then it’s horizontal range and maximum height will be […]
If two vectors are equal in magnitude and their resultant is also equal in magnitude to one of them, then the angle between the two vectors is
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(a) 60° (b) 120° (c) 90° […]
A rod of weight W is supported by two parallel knife edge A and B and is in equilibrium, in a horizontal position.The knives are at a distance d from each other.The centre of mass […]
A particle performing uniform circular motion has angular momentum L.If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is
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(a) L/4 (b) 2L (c) 4L […]
The drive shaft of an automobile rotates at 3600 rpm and transmits 80 HP up from the engine to the rear wheels.The torque developed by the engine is
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(a) 16.58 Nm (b) 0.022 […]
When a ceiling fan is switched on, it makes 10 revolutions in the first 3s.Assuming a uniform angular acceleration,how many rotation it will make in the next 3s?
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(a) 10 (b) 20 […]
An inclined plane makes an angle of 30° with the horizontal.A solid sphere rolling down this inclined plane from rest without slipping has a linear acceleration equal to
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(a) g/3 (b) 2g/3 […]
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