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A police officer investigating an accident estimates from the damage done that a moving van hit a stationary van at 27 km/h.
If the moving van left skid marks 45 meter long, and if the coefficient of kinetic friction is 0.71, determine what was the initial speed of the moving van?
A student throws a set of keys vertically upward to her sister in a window 4.0 m above. The keys are caught 1.5 s later by the sister’s outstretched h&. Find initial speed were the keys thrown?
Light travels a distance of 0.945m in 4.50ns in a given substance. What is the index of refraction of this substance
A 1.20 kg mass on a horizontal spring oscillates on a frictionless surface with a displacement as a function of time given by x(t) = 0.075cos(4.16t – 2.45). (Units are standard units.) Find the time for one complete vibration. Find the force const..
If B (magnetic) field is decreasing into the plane and a circular coil is on the plane, what is the direction of induced current flow through the coil
an unstable particle is created in the upper atmosphere from a cosmic ray and travels straight down toward the surface
Calculate the magnetic fields due to the displacement current midway between the plates at a radius equal to half the plate radius
The mass of the barge is 9000 kg, and its acceleration is 0.15 m/s2 down the canal. Illustrate what are the magnitude and the direction of the force on the barge from the water?
A pinhole camera takes a picture of a building 200 m tall. If the height of the image on the back of the camera is 5 cm tall, how far is the camera from the building
Assume that you wish to fabricate a uniform wire out of 0.850 gram of copper. Suppose the wire has a resistance R = 0.500 Ω, and all of the copper is used. Find what will be the length of the wire
A particle moves in a one-dimensional potential given by V(x) = Vo(e^-ax + bx),(V(x) is potential not velocity), Sketch the potential and the force as functions of x
A brick is originally 7.72 cm high and an aluminum can is initially 7.73 cm high. By how much should their temperatures be raised in order for the brick and the can to have precisely the similar height?
Our Sun has a radius of 7 x 10^8 meters. From the amount of thermal energy we receive on Earth, determine the average surface temperature of the Sun
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