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A police officer investigating an accident determines from the damage done that a moving van hit a stationary van at 28 km/h.
If the moving van left skid marks 49 meters long, and if the coefficient of kinetic friction is 0.69, determine the initial speed of the moving van?
if a car stops suddenly you feel thrown forward. wed like to understand what happens to the passengers as a car stops.
A hot-air balloon is ascending at the rate of 14 m/s and is 57 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
The radius of the hydrogen atom is 0.053 nm. What is the frequency of the circular motion of the electron in the hydrogen atom
The combination of an applied force and a friction force produces a constant total torque of 35.2 N · m on a wheel rotating about a fixed axis. The applied force acts for 6.10 s. During this time, the angular speed of the wheel increases from 0 to..
What is the magnification of an astronomical telescope whose objective lens has a focal length of 74 cm and whose eyepiece has a focal length of 2.9 cm
How far away from the people is the plane.
A weather vane initially at rest has a moment of inertia of 0.103 kg · m2 about its axis of rotation, Find the angular velocity of the weather vane just after it is struck
We have a hollow metallic sphere with charge -5.0 µC and radius 5.0 cm. What charge now rests on the outer surface of the sphere
A circuit containing a 3.9H inductor has an alternating current applied to it. If Irms is 4.4 A and Vp is 45V, find the frequency of the signal
A 1.98 nF capacitor with an initial charge of 4.55 µC is discharged through a 1.23 k? resistor. What is the maximum current in the resistor
a solid cylindrical disk has a radius of 0.25 m and it can rotate about a vertical axis.a. when a 45 n force is applied
A hot-air balloon is rising upward with a constant speed of 2.68 m/s. When the balloon is 5.62 m above the ground, How much time elapses before the compass hits the ground
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