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Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them. By the time Arthur and Betty meet, what is Spot's displacement?
In reality, the COP of the heat pump will only be 60 percent of the ideal value. What is the minimum power of the electric motor when the COP is 60 percent of the ideal value
q1. a 1190-n uniform beam is attached to the vertical wall at one end and is supported by a cable at the other end. a
A crate of mass 2000 kg is hanging from a crane at the end of a cable 12 m long. what angle will the cable finally make with the vertical
A 60 g ball is tied to the end of a 50 cm --long string and swung in a vertical circle. how far to the right does the ball hit the ground
A battery has three cells connected in series, each with an internal resistance of 0.014Ω and an emf of 2.00 V. How much current is in each cell
A 1250 kg cannon, which fires a 80 kg shell with a speed of 546 m/s relative to the muzzle, is set at an elevation angle of 39° above the horizontal. At what angle with the ground is the shell projected
For the infinite square well problem an electron spends 40% of its time in the n=3 state and 60% of its time in the n=5 state. What is the average energy of the electron
A ball with a horizontal speed of 1.25m/s rolls off a bench 1.00m above the floor. How long will it take the ball to hit the floor
A long horizontal hose of diameter 4.2 cm is connected to a faucet. At the other end, there is a nozzle of diameter 1.4 cm. What is the velocity of the water in the hose
Calcualte the radiation dosage (in rads) for a 67-kg person that is exposed to 6.0 seconds to a 3.0 Ci source of beta radiation.
A spherical capacitor with a 1.20 mm gap between the spheres has a capacitance of 60.0 pf. What are the diameters of the two spheres
A small electric car overcomes a 250 N friction force when traveling 30 km/h. How much power is dissipated in the coils
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