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Speeding ticket? You are driving your car uphill along a straight road. Suddenly you see a car run a red light and enter the intersection just ahead of you. You slam on your brakes and skid in a straight line to a stop, leaving skid marks 5 feet long. A policeman observes the whole incident and, much to your shock, gives you a ticket for exceeding the speed limit of 80 mph. When you get home, you consult your Physics notes and estimate that the coefficient of kinetic friction between your tires and the road was 2 and the coefficient of static friction was 1. You estimate that the hill made an angle of 40 degrees with the horizontal. You look up in your owner's manual and find that your car weighs 3000 lb. Will you fight the traffic ticket in court?
A hydrogen atom initially in the ground state absorbs a photon, which excites it to the n = 12.0 state. Determine the frequency of the photon
How high would 20-C water climb in a 24-mm-diameter vertical capillary tube if it makes an angle of 20- with the wall of the tube?
Consider a small frictionless puck perched at the top of a fixed sphere of radius R. If the pluck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere?
A thin uniform rod (length = 2.01 m, mass = 3.11 kg) is pivoted about a horizontal frictionless pin through one of its ends. What is the angular acceleration of the rod at the instant it is released
The positioin of a particle moving along the x-axis is given by x =( 21+22t-6t^2)m, where t is in s. What is the average velocity during the time interval t= 1.0 s to t = 3.0s
A car drives 5.0 km north, then 7.3 km east, then 6.7 km northeast, all at a constant velocity. If the car had to perform 2.6 × 106 J of work during this trip, what was the magnitude of the average frictional force on the car
An athlete competing in the hammer throw swings a 4.0 kg hammer on a chain in a horizontal circle with a 5.4 m diameter. What is the tension in the chain attached to the hammer at that speed
A projectile is fired horizontally from a gun that is 47.0 m above flat ground; emerging from the gun with a speed of 250 m/s.
Assuming that the uncertainties on the masses and velocities are M= 0.1 kg and V = 0.01 m/s, calculate the uncertainty in the momentum and kinetic energy for the second trial (bottom row).
two positive point charges are held in place 0.60 m apart. they are then moved so that their electric potential energy
What average thermal power is produced as rock stops?
Two point charges lie along the y-axis. A charge of q1 = -7 uC is at y = 6, and a charge of q2 = -6.5 uC is at y = -4 m. Locate the point (other than infinity) at which the total electric field is zero.
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