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A driver in a moving car applies the brakes. The car slows to a final speed of 1.80 m/s over a distance of 40.0 m and a time interval of 8.30 s. The acceleration while braking is approximately constant.
1. What is the car's original speed before braking?
2. What is its acceleration during this time? (The car's initial velocity is in the positive direction. Indicate the direction with the sign of your answer.)
The treasure map in the figure gives the following directions to the buried treasure: "Start at the old oak tree, walk due north for 460 paces, then due east for 130 paces. How far should you go to reach the treasure
A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 7.0 m/s
Suppose that the net horizontal force is because of rolling friction only and take the free-fall acceleration to be g = 9.80 m/s^2. What is the coefficient of friction for the tire under low pressure.
determine the tangential and centripetal components of the net force exerted on a car by the ground when its speed is
The load-bearing piston in a certain hydraulic system has an area 49 times as large as the input piston. how large a force must be applied to the input piston
A wire of resistance 5.4 ? is connected to a battery whose emf ? is 2.0 V and whose internal resistance is 1.0 ?. In 1.8 min, how much energy is dissipated as thermal energy in the wire
A 750 air-track glider attached to a spring with spring constant 10.5 is sitting at rest on a frictionless air track. A 475 glider is pushed toward it from the far end of the track at a speed of 118 .
Your car horn happens to have the unusual property of emitting a pure tone at a frequency of 640. Hz. What is the frequency of the echo
A uniform metal rod, with a mass of2.9kg and a length of0.9m, is attached to a wall by a hinge at its base. Find the horizontal component of the force exerted on the rod by the hinge
A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward
An arrow is shot with a speed of 18.5 m/s at an angle of 50 degrees from the horizontal. What are the respective horizontal and vertical component of the initial velocity of the arrow?
A 15.0 kg bucket of water is suspended by a ropewrapped around a windless, that is a solid cylinder 0.500 m indiameter with mass 11.0 kg. With what speed does the bucket strike the water
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