Laws of motion
A mass 'm' is supported by a massless string wound around a uniform hollow cylinder of mass m and radius R. If the string does not slip on the cylinder, with what acceleration will the mass fall or release?
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A block B is pushed momentarily along a horizontal surface with an initial velocity v . If mu is the coefficient of sliding friction between B and the surface, block B will come to rest after a time:
A batsman deflects a ball by an angle of 90o without changing its initial speed, which is equal to 54 km/hr. What is the impulse imparted to the ball? (Mass of the ball is 0.15 kg).
The upper half of an inclined plane with inclination ϕ is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by
An explosion blows a rock into three parts. Two parts go off at right angles of each other. These two are 1 kg first part moving with a velocity of 12ms−1 and 2 kg second part moving with a velocity of 8ms−1. If the third part files off with a velocity of 4ms−1, its mass would be :
A bullet is fired from a gun. The force on the bullet is given by F=600−2×105 t, where F is in newtons and t in seconds. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet?
A block of mass 10kg is placed on a rough horizontal surface having coefficient of friction μ=0.5 . If a horizontal force of 100N is acting on it, then acceleration of the will be.
A book leans against a crate on a table. Neither is moving Which of the following statements concerning this situation is/are incorrect. .
A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency ω. The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time