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A car's bumper is designed to withstand a 6.84-km/h (1.9-m/s) collision with an immovable object without damage to the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force on a bumper that collapses 0.240 m while bringing a 910-kg car to rest from an initial speed of 1.9 m/s.
A fan turns at a rate of 900 rpm (i.e., rev/min). Find the angular speed of any point on one of the fan blades
How much work does a supermarket checkout attendant do on a can of soup he pushes 0.310 m horizontally with a force of 5.20 N? Express your answer in joules and kilocalories.
What reading will a voltmeter, of internal resistance 91 Ω, give when used to measure the voltage across each resistor? What is the percent inaccuracy due to meter resistance for each case?
A 45.6-kg girl is standing on a 155-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity of 1.40 m/s relative to the plank. (a) What is the ve..
A capacitor is a device used in a variety of electronic circuits. In a simple design a capacitor consists of two parallel metal plates of area A separated by a distance d. When the plates are connected to the positive and negative terminals of a b..
Calculate the least velocity of projection required to give amissile a horizontal displacement of 500m if the angle ofprojection is 24 degrees
A uniform metal rod, with a mass of 3.4 kg and a length of 1.3 m, is attached to a wall by a hinge at its base. Find the vertical component of the force exerted on the rod by the hinge
A parallel-plate capacitor has square plates that are 6.00cm on each side and 4.20mm apart. If the potential difference between the plates is 78.0V , how much electrical energy is stored in the capacitor
The telescope should allow you to view an animal 100 m from the objective with the final image being formed 1.0 m from the eyepiece. Don't forget to consider which side of the eyepiece the final image must form and whether the final image is a rea..
A 10.0 m rope of negligible mass connects two astronauts, each having a mass of 75.0 kg. find the initial angular momentum of the system
A planoconcave lens (n = 1.52) has a focal length of -24.6cm. What is the radius of the concave surface
A 0.420 kilogram pendulum bob passes through the lowest part of its path at a speed of 3.30 m/s. find what angle does the cable make with the vertical
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