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A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.1 104 rev/min.
(a) Find the drill's angular acceleration.
rad/s2
(b) Determine the angle (in radians) through which the drill rotates during this period.
rad
A large punch bowl holds 3.00kg of lemonade (which is essentially water) at 25.0C. A 5.80×10^?2kg- ice cube at -10.0C is placed in the lemonade a)What is the final temperature of the system? Ignore any heat exchange with the bowl or the surroundin..
A building is being knocked down with a wrecking ball, which is a big metal sphere that swings on a 10-m-long cable. How much time do you have to move out of the way
A heat pump uses an ideal Carnot cycle to heat a house. The outside air has a temperature of 292 K, What is the coefficient of performance of this heat pump
A 9.10 kg board is wedged into a corner and held by a spring at a 50° angle, as the Illustrating shows. The spring has a spring constant of 196 N/m and is parallel to the floor.
By how much does the ball clear the net. How far below top surface would the medallion appear if the observer (not wearing goggles) and the block were under water.
Physics: Mechanics about two curling stones - calculate speed, resistive force Two curling stones A and B, each having a mass of 2 kg, are on an ice rink floor. A is stationary and 10 meters from a boundary wall, while B is sliding at right angles..
A 86 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 380N. What is the final speed of the crate
A high-voltage transmission line with a resistance of 0.34 omegacap.gif/km carries a current of 960 A. What is the power loss due to resistance in the line
You drive west at 70km/h for 24 min , then follow a road that goes 38 degrees south of west, driving at 96 km/h for another 36 min. Find your average velocity for the trip
A parallel-plate capacitor has a capacitance of c1 = 5.5 ?F when filled with air and c2 = 33 ?F when filled with a dielectric oil at potential difference of 12 V, Input an expression for the permittivity of the oil
A cube of ice is taken from the freezer at -8.7°C and placed in a 97 g aluminium calorimeter filled with 351 g of water at the room temperature of 20°C. The final situation is observed to be all water at 19°C. What was the mass of an ice cube.
A girl swings back and forth on a swing with ropes that are 4.00m long. The maximum height she reaches is 1.50m above the ground, What is the girl's maximum speed
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