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Q1. On an icy day, you worry about parking the car in your driveway that has an incline of 12 degrees. Your neighbour's driveway has an incline of 9.00 degrees, and the driveway across the street is at 6.00 degrees. The coefficient of static friction between tire rubber and ice is 0.15. Which driveway will be safer to park in?
Q2. A 40-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, kinetic energy decreases to 240J from 470J. How high does she rise during this interval? Avoid air resistance.
Horse races once around a circular track in a time of 176 s, with a speed of 26 m/s. What is the radius of the track.
A car carrying a 77-kg test dummy crashed into a wall at 27m/s and is brought to rest in 0.1 s. demonstrate that the average force exerted by the seat belt on the dummy is 18,760N.
Illustrates the difference between acceleration and velocity
Speedboat A negotiates a curve whose radius is 150 m. Speedboat B negotiates a curve whose radius is 190 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
How many wavelengths are there in one pulse
Displacement d2 is in the xz plane 30° from the positive direction of the x axis, has a positive z component, and has magnitude 1.10 m.
A 45.0kg girl is standing on a 170 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.53m/s relative to the plank.
Imagine that plane reaches the necessary takeoff velocity
A 4.70 kg mass causes a vertical spring to stretch 0.850 meters. The spring is after that stretch and extra 0.270 meters and release (as a stopwatch starts) causing the spring and mass to oscillate.
What is amplitude of the electric component of the signal
Calculate the volume charge density of the atmosphere
What approximations or simplifying assumptions must you make in the calculations? (Note: Some of these choices are false because they are wrong physics!)
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