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Q. Two highways intersect. At the instant shown, a police car P is distance dP = 760 m from the intersection and moving at speed vP = 76 km/h. Motorist M is distance dM = 480 m from the intersection and moving at speed vM = 48 km/h. What are the (a)x-component and (b)y-component of the velocity (both in km/h) of the motorist with respect to the police car? (c) For the instant, what is the angle between the velocity found in (a) and (b) and the line of sight between the two cars?
A straight, stiff wire of length 1.00 m and mass 21g is suspended in a magnetic field B = 0.58T. The wire is connected to an emf. How much current must flow in the wire and in what direction so that the wire is suspended and the tension in the sup..
You are to gracefully crawl in the tube and sit calmly in seat without holding on to anything. The cannon will then be raised to an angle such that your speed through the air at your highest point is 10 ft/sec.
A star is moving away from the Earth at the speed of 200 km/s. What will be the wavelength of a spectral line that would have the wavelength of 500 nm if the star were at rest.
A race car has a mass of 702kg. It starts from rest and travels 42 m in 3 s. The car is uniformly accelerated during the entire time. What net force is exerted on it.
A 78-kg base runner begins his slide into second base when he is moving at a speed of 4.2 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches base.
The movement of the water because of the tides will give kinetic energy to the turbine blades, causing them to spin. In the calculations that follow ignore any frictional drag because of the seawater.
A ball on the porch rolls 60 {rm cm} to the porch's edge, drops 40 {rm cm}, continues rolling on the grass, and eventually stops 80 {rm cm} from the porch's edge.
A student removes a 10.50 kg stereo from a shelf that is 1.802 m high. The amplifier is lowered at a constant speed to a height of 0.75 m. What is the work done by a) person and b) gravitational force that acts on the amplifier.
Coefficient of kinetic friction between tires and road
A long, straight wire has a 13.7 A current flowing in the positive x-direction. Close to wire is a square loop of copper wire that carries a 2.17 A current in direction shown. The near side of the loop is d = 46.3 cm away from the wire.
An object, mass 2.96kg, moves in a horizontal circle with a radius of 3.8m. The object has the intial velocity of 32.6 m s-1. If the kinetic coefficient of friction between the object and the surface is 0.31, then number of completed revolutions (..
A loudspeaker of mass 22 {rm kg} is suspended a distance of h = 1.60 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.30 {rm m}.
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