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Vector A is 25.0 m long and pointing 30 degree North of west and Vector B is expressed at 12.0i - 8.5j . Find
(a) the magnitude R and
(b) the direction of the resultant vector.
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 443 Hz when the train is approaching him.
The battery charger for an MP3 player contains a step-down transformer with a turns ratio of 1:27, What voltage does the secondary coil of the transformer provide
An 11.90 V battery is connected to a series circuit containing a 6ohm resistor and a 2.30 H inductor. The circuit is established and current is 1.9833 A. How long will it take the current to reach 50 percent of its final value? Answer in units of s
A jetliner is moving at a speed of 235 m/s. The vertical component of the plane's velocity is 42.9 m/s. Evaluate the magnitude of the horizontal component of the plane's velocity.
A dolphin in seawater at a temperature of 25 °C makes a chirp. How much time passes before it hears an echo from the bottom of the ocean, 208 m below.
Two people, one of mass 75kg and the other of mass 60kg, sit in a rowboat of mass 80 kg. With the boat initially at rest, two people, who have been sitting at opposite ends of the boat 3.2 m apart from each other, now exchange seats. How far and i..
What friction torque is required to reduce angular speed
A rocket is fired at 48m/s, in a direction 400 to the horizontal. It explodes in mid air, Find the speed of the rocket just before the explosion
A 3.11kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform8.23kg cylindrical pulley, What is the rotational inertia of the pulley
A copper rod 20 cm long having a cross-sectional area of 7.0 cm2 is used to connect a boiler maintained at 100 oC to a large block of ice at 0 oC. What is the rate of change in entropy of the boiler
A potters wheel is a disk of mass 3.50kg and radius .450m and is spinning freely around a vertical axis through its center with an angular speed of 14.0rad/s. what is the angular speed of the wheel+clay
A gas is contained in a cubic box whose sides are 3m long. If the gas is initially at 80 K, and it is heated up to 320 K at constant volume, What is the final pressure
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