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A machinist turns the power on to a grinding wheel, at rest, at time t = 0 s. The wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 83 rad/s. The wheel is run at that angular velocity for 29 s and then power is shut off. The wheel slows down uniformly at 2.8 rad/s^2 until the wheel stops. In this situation, the time interval of deceleration is closest to:
A block of unknown mass is attached to a spring of spring constant 6.5 N/m and undergoes simple harmonic motion with an amplitude of 10 cm. Calculate the maximum acceleration of the block
A 1000-kilogram race car is traveling at 60 m/s around a curved section of track that has a radius of 300 m. What is the centripetal force that acts on the car
Five students are ice stating. They hold hands while skating with a velocity of 10 sec and suddenly attempt to skate in a circle. calculate the centripetal acceleration and force acting on this student
The electric motor in a toy train requires a voltage of 3.1V .Find the ratio of turns on the primary coil to turns on the secondary coil in a transformer that will step the 110V household voltage down to 3.1V .
Severe stresses can be produced in the joints by jogging on hard surfaces or with insufficiently padded shoes, Calculate the force on the ankle joint. The mass of the joggers leg is 8.6 kg.
A 1500 -kg automobile travels at a speed of 75 -km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop.
A bicycle wheel of radius 20 cm is mounted at the middle of an axle 43 cm long. The tire and rim weigh 24 N. The wheel is spun at 13 rev/s, What is the angular speed of precession
An anchor holding a boat stationary on a river forms a 65 degree angle with the river bottom. The anchor line is 40 meters long. Assume the river has a uniform depth, how deep is the river directly below boat.
A copper vat is 12 m long at room temperature (20 degrees Celsius). How much longer is it as it contains boiling water at 1 atm pressure.
Two metal cubes, one copper and one aluminum, with sides of length a are arranged as shown, find the thermal resistance of each cubeb
A quasar 10 billion light years from Earth appears the same brightness as a star 5.9*10^4 light years away. How does the power ouput of the quasar compare with that of the star
A 180kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.130m/s. How much work must be completed on the hoop to stop it.
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