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Suppose you are driving on the interstate at 90 mph when you see a highway patrol car parked upahead. You apply your brakes, decelerating at a constant rate of4.4 mph/sec until you have reduced your speed to 65 mph. You then maintain aconstant speed of 65 mph. You pass the patrol car 18 seconds after you initially applied the brakes and are relieved that he doesn't pull out after you. How far away was the highway patrol car when you first saw it?
at the top of a 100m cliff a backpack is dropped. one second later an archer fires an arrow straight down that hits the backpack just as it reaches the ground, How long does it take for the backpack to reach the ground
A skateboarder shoots off a ramp with a velocity of 5.7 m/s, directed at an angle of 53° above the horizontal. how far is this point horizontally from the end of the ramp
Two children with masses of 23 and 41 kg are sitting on a balanced seesaw. If the lighter child is sitting 3 m from the center, where is the heavier child sitting from the center
One point-like charge of +20 nC sits at the center of a thick spherical shell of inner radius 4 cm and the outer radius 6cm. The shell is made of copper and has a net charge of -10 nC.
A uniform 2.15- kg spinning disk with a radius of 0.233 m is brought to rest by a brake-pad pressed against the side 0.149 m from the rotation axis. What frictional force was applied by the brake pad
A resistor with R = 1.5 k? is connected to an AC generator that operates at 60 Hz with an amplitude of 49 V. (a) Find the amplitude of the current through the resistor. A
At some point in its orbit, our asteroid is moving with a speed of 20 kilometers per second. Determine the kinetic energy of the asteroid
A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, How deep is the hole
A playground is on the flat roof of a city school, 4.6 m above the street below (see figure). The vertical wall of the building is h = 6.10 m high, forming a 1.5-m-high railing around the playground. Find the vertical distance by which the ball cle..
A Hall probe serves to measure magnetic field strength. Such a probe consists of a poor conductor 0.165 mm thick, What is the magnetic field strength
A 2.63g aluminum bullet at 31.9 degrees C is fired at a speed of 204 m/s into a large block of ice at 0 degrees C, in which it embeds itself. What quantity of ice melts
A very powerful vacuum cleaner has a hose 2.95 cm in diameter. With no nozzle on the hose, what is the weight of the heaviest brick that the cleaner can lift
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