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An automoble of mass 3000kg is driven into a brick wall in a safetytest. The bumper behaves like a hooke's-law spring. It has aneffective spring constant of 5x106N/m, and is observed to compress a distance of 5.29 cm as the car is brought to a rest. What was the initial speed of the automobile? Answer in units ofm/s.
Two balls are released simultaneously from the top of a tall building. Ball A simply dropped with no initial velocity, and Ball B is thrown downward with and initial velocity of 12 m/s. How far has each ball dropped
a converging lens forms a real image 1.27 times the size of the object. The object distance is 22cm. Find the distance of the focal point from the center of the lens
A block with mass m =6.4 kg is hung from a vertical spring. When the mass hangs in equilibrium, the spring stretches x = 0.27 m. what is the magnitude of the net force on the block
Near the South Pole, a supply plane going at 120 mph drops a 60 kg supply package into a sled that was initially at rest. Estimate the mass of the sled
A gas bubble with an initial volume of 7.00 milliliters rises from a depth of meters. If the temperature does not change, what is its volume, to nearest ml, when it reaches the surface (density of water=1000 kg/m^3)?
bob has just finished climbing a sheer cliff above a beach and wants to figure out how high he climbed. all he has to
In one type of computer keyboard, each key holds a small metal plate that serves as one plate of a parallel-plate, air-filled capacitor. Calculate the capacitance before the key is depressed
A pair of slits separated by d = 1.30 mm is illuminated with light of = 610 nmwavelength and falls on a screen L = 2.00 m away. what was the minimum glass thickness
Three charges are at rest on the z axis: q1 = ?7.21 mC at z = 4.58 m, q2 = ?1.79 mC at z = 0 m, What is the potential energy of this system
A 39.2-µF capacitor is connected across a 64.2-Hz generator. An inductor is then connected in parallel with the capacitor. What is the value of the inductance
Find the position of an object in front of a screen to obtain an image of size twice larger than its original size on the screen.
Imagine holding the above plastic block under water. When released, what is the upward acceleration of the block
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