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A train at a constant 60.0 km/h moves east for 21 min, then in a direction 62.0° east of due north for 29.0 min, and then west for 56.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of its average velocity during this trip?
A machinist turns the power on to a grinding wheel, at rest, at time t=0 s. What is the angular velocity in the time interval from t=0 to t=25s
A solid sphere is released from rest on an incline. When it reaches the bottom, what fraction of its total kinetic energy is rotational
n = 3.78 mol of Hydrogen gas is initially at T = 366 K temperature and pi = 2.88×105 Pa pressure. How much work did the external force perform
A fire in an enclosure has reached flashover, & the gas temperature is assumed to be uniform at 1000oC. The enclosure has an opening 3 m wide & 2 m high. Find the position of the neutral layer, measured from the bottom of the opening.
A 5-kg mass moves under the influence of a force F=(2e^t ?)N, where t is time. What is the particle's position as a function of time
An automobile moves at a constant speed over the crest of a hill. the driver moves in a vertical circle of radius 17.5m. at the top of the hill, she notices that she barely remains in contact with the seat. find the speed of the vehicle.
How long would it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 335m.
A solenoid with a cross-sectional area of 1.97×10^3 is 0.810 long and has 480 turns per meter. Find the magnitude of induced emf in this solenoid
A certain part of an aircraft engine has a volume of 1.2 ft3. Find the weight of the piece when it is made of copper
A large gate weighing 175 N is supported by hinges at the top and bottom of the wooden frame, and is further supported by a wire. find the sum of the vertical forces on the hinges
A camera is supplied with two interchangeable lenses, whose focal lengths are 41.0 and 150.0 mm. What is the height (including sign) of her image on the image sensor
question1a 44.0 kg child is in a swing that is attached to ropes 1.90 m long.the acceleration of gravity is 9.81
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