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A 6 kg grinding wheel of radius 0.2 m rotates at a constant rotational frequency of 4 rad/s when an object makes contact with the outer edge of the wheel. Friction causes the wheel to stop in 2 seconds. What is the average torque on the wheel by the frictional force?
In the figure 29-49, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 30 cm. The currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3, and each wire carri..
Water at 22.0 °C is sprayed onto 0.203 kg of molten gold at 1063 °C (its melting point). What is the minimum mass of water that must be used
A highway curve with radius 850 ft is to be banked so that a car traveling 48.0 mph will not skid sideways even in the absence of friction
A thin film of plastic (n = 1.43) coats a piece of glass (n = 1.6). What is the minimum thickness of the film for which 500 nm light does not reflect off of it
A 17 g lead bullet traveling at 218 m/s passes through a thin iron wall and emerges at a speed of 161 m/s. what will be the temperature rise of the bullet
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. How many electrons pass through the wires connected to the patient
a hiker who weighs 929 n is strolling through the woods and crosses a small horizontal bridge. the bridge is uniform
Three resistors are connected in series across a 11-V power supply. what is the exact potential drop (in volts) across resistor 3
You throw a ball straight down from an apartment balcony to the ground below. find the height of the balcony
A 3.91-kg fish swimming 2.13 m/s swallows an absent-minded 6.81-kg fish swimming toward it at a velocity, What is the velocity v of the smaller fish before lunch
Two barometers are made with water and mercury. If the mercury column is 45 in. tall, how tall is the water column
A 3.02 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=14.3 N at an angle θ= 15.5° above the horizontal, as shown.
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