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A disk of radius 0.30 meter and mass 7 kilogram is spinning clockwise at 22 rad/s about a fixed axis in the center. After rotating through 65 radians the disk is spinning in the opposite direction at 18 rad/s.
a) Find at what time does the disk momentarily come to rest?
b) Find the smallest magnitude the total acceleration can have as the disk rotates through the 65 radians? Describe the velocity of the wheel when this happens.
c) Find what will the time be the first time the radial acceleration is momentarily g (i.e. the shortest time to when the radial acceleration is g)?
A circular hole in an aluminum plate is 3.263 cm in diameter at 0.000°C. What is its diameter (in cm) as the temperature of the plate is raised to 129.8°C? Give the answer to four significant figures. The linear expansion coefficient of aluminum i..
Your teacher tosses a basketball. The ball gets through the hoop (lucky shot). How long does it take the ball to reach the hoop
A rifle is aimed horizontally toward the center of a target 100 maway. If the bullet strikes 10 cm below the center, what is the velocity of the bullet
In a ballistics test, a 25.0g bullet traveling horizontally at 1200m/s goes through a 40.0cm -thick 350kg stationary target, What average force does the bullet exert on the target
A firm wants to determine the amount of frictional torque in their current line of grindstones, so they can redesign them to be more energy efficient. What is the angular acceleration of the grindstone
Common transparent tape becomes charged when pulled from a dispenser. calculate the magnitude of the charge if electrostatic force is great enough to support the weight of a 9.00 mg piece of tape held 0.80 cm above another
A train at a constant 60.0 km/h moves east for 21 min, then in a direction 62.0° east of due north for 29.0 min, and then west for 56.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and wes..
When a high-power laser is used in the Earth's atmosphere, the electric field associated with the laser beam can ionize the air, What laser beam intensity will produce such a field
A red ball is thrown down with an initial speed of 1.1 m/s from a height of 29.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, What is the maximum height the blue ball reaches
A 2.50g bullet, travelling at a speed of 395m/s, strikes the wooden block of a ballistic pendulum. The block has the mass of 265g. How high does the combination rise above its initial position.
Consider a copper wire (mass density 8.9 g/cc, resistivity 1.7E-8 ohm-m) with a diameter of 0.43 mm, How many meters long is this wire
The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What does it weigh on the moon
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