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A 900-kg car is moving at 33.3 m/s. A braking force of -7548 N is applied for 2.70 s. What is the velocity of the car when the brakes are released?
Two objects of weight W1 and W2 are placed on a frictionless inclinced plane are connected by a massless string looped over a massless pulley. Find the acceleration of the two objects
Why is the normal force of an object zero at the top of a hill (such as the hill of a roller coaster)? I'm doing a circular motion unit and I found a few problems where this is the case, and I was wondering how it works.
A ball is thrown horizontally with a speed of Vo = 20.0 m/s from the top of a building of height h = 42.1 meters. What is the angle below the horizontal made by the velocity vector of the ball
A new car is crash tested by running it into a heavy barrier at 41 km/h. find the average force exerted on the car by the barrier
Assume the electric field near the northwest corner of your table is uniform at 3x10^4N/C. We assign 0 as the value of electric potential at the corner. What is the potential 2cm south of the corner?
A cylindrical copper rod has resistance of 0.3 ohm. It is reformed to 3.8 timesm its original length with no change of volume. What is its new resistance in ohms?
A magnetic field has a magnitude of 1.20 10-3 T, and an electric field has a magnitude of 5.40 103 N/C. find the magnitude of the net force that acts on the charge
A wheel 32.1 cm in diameter accelerates uniformly from 227 rpm to 363 rpm in 5.11 s. How far will a point on the edge of the wheel have traveled in this time
In a specific heat experiment 184.0 grams of aluminum (C=913.0 J/kg.K) at 100.0°C) is mixed with 48.0 g water at 20.0°C. Find the entropy change of the aluminum
Two automobiles are equipped with the same single-frequency horn. What is the frequency the horns emit
A resistor draws 5.00A from an ideal 12.0-V battery. If this current is used to calculate the resistance, by what percent will the result be in error
The length of a beam increases by 1.46mm when its temperature is raised from 44.92oC to 90.5 oC. What is the length of the beam at the initial temperature? The thermal expansion coefficient of the material is 0.000053 /oC.
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