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Q. A grindstone of a radius 4 m is firstly spinning with a radius of 8 rad/s. The angular speed is then increased to 12 rad/s over next 4.0 seconds. Suppose that the angular acceleration is constant. What is the average angular speed of grindstone?
Q. A string under a tension of 76 N is used to whirl a rock in a horizontal circle of radius 3.8 m at a speed of 21.84 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.494 m long and the speed of the rock is 70.3 m/s, the string breaks. What is the breaking strength of the string?
A 66 N m torque acts on a wheel with a moment of inertia 175 kg m2. If the wheel starts from rest, how long will it take the wheel to make one revolution? The system is released from rest and accelerates under the weight of m2.
The human body can survive an acceleration trauma incident (sudden stop) if magnitude of the acceleration is less than 250;{rm m}/{rm s}^{2}.
Assess the benefits brought about by the application of lean techniques at Wiremold. Explain your answer by describing the changes and their outcomes.
A high-voltage transmission line with the resistance of 0.30 /km carries a current of 950 A. The line is at a potential of 710 kV at the power station and carries the current to a city located 161 km from the station.
How far will it coast before starting to roll back down. In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find the acceleration of the sled and child.
If a 200 lb bungee jumper jumps from a bridge 150 ft and touches the top of the river. If the cord absorbs 14 percent of the energy how far will be man be at the Top of the next bounce from the river bottom.
A uniform steel beam has a mass of 1640 kg. On it is resting half of an identical beam. What is the vertical support force at each end.
How fast will the electron be moving. What was his average speed (in m/s) for the race.
At t=0 a grinding wheel has an angular velocity of 30.0 rad/s. It has a constant angular acceleration of 31.0 rad/s^2 until a circuit breaker trips at time t = 2.00 s. From then on, it turns through an angle 428 rad as it coasts to a stop at constant..
A ranger in a national park is driving at 24.0 mi/h when a deer jumps into the road 270 ft ahead of the vehicle. After a reaction time of t, ranger applies the brakes to produce an acceleration of a = -9.00 ft/s2. What is the greatest reaction tim..
A certain cable car in San Francisco can stop in 10s while travelling at maximum speed. On one occasion, driver sees a dog a distance d m in front of the car and slams on the brakes instantly.
What is an average power output of the laser. What is the rms value of the electric field in the beam.
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