nonuniform circular motion q 1

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1. A car speeds up as it turns from traveling due south to heading due east. When exactly halfway around the curve, the car’s acceleration is 1.8 m/s2, 23° north of east. What are the radial and tangential components of the acceleration at that point?

2. In the Bohr model of the hydrogen atom, an electron (mass =

9.10
10
-31
kg) orbits a proton at a distance of

3.39
10
-9
m. The proton pulls on the electron with an electric force of

2.01
10
-11
N. How many revolutions per second does the electron make?

3. A highway curve of radius 410 m is designed for traffic moving at a speed of 90 km/hr. What is the correct banking angle of the road?

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