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Q. An electric motor rotating a workshop grinding wheel at the rate of 106 rev/min is switched off. Assume the wheel has a stable negative angular acceleration of magnitude 1.50 rad/s2.
How long does it take for the grinding wheel to stop?
Q. On an amusement park ride, passengers are seated in a horizontal circle of radius 7.50m. The seats begin from rest and are regularly accelerated for 21 seconds to a maximum rotational speed of 1.40 rad/s. What is the instantaneous tangential speed of the passengers 15 s after acceleration begins?
A duck has a mass of 2.6 kg. As the duck paddles, a force of 0.11 N acts on it in a direction due east. In addition, the current of the water exerts the force of 0.12 N in a direction of 44° south of east. When these forces begin to act, the velocity..
How much work done against force of gravity
A shell of mass m and speed v explodes into two identical fragments. If the shell was moving horizontally (the positive x direction) with respect to Earth, and one of the fragments is subsequently moving vertically with speed v, find out the velocity..
An engine does 20000 J of work and rejects 6120 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir.
An 11g bullet is fired into an 11kg wood block that is at rest on the wood table. The block, with the bullet embedded, slides 5.11 across the table. The coefficient of kinetic friction for wood sliding on wood is 0.25.
A chair of weight 130 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 45.0 fixed at an angle of 39.0below the horizontal and the chair slides along the floor.
A camera flashtube requires 8J of energy per flash. The flash duration is 2m/ss}. What power does the flashtube use while it's flashing?
Runner A is at first 5.4 km west of a flagpole and is running with a constant velocity of 2.6 km/h due east. Runner B is initially 3.0 km east of the flagpole and is running with the constant velocity of 8.8 km/h due west. What would be the distance ..
What is an angular acceleration
In a physics laboratory experiment, a coil with 200 turns enclosing an area of 12.0 cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to field.
What is the change in length of the rope whilst the skier has the acceleration whose magnitude is 0.65 m/s2.
Compute the magnitude & direction of the current.
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