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1. Calculate the average power in kilowatts required to pull a car up a ramp if the amount of work is 250 kj over a period of 45 seconds.
2. Calculate the mechanical advantage of a group of pulleys used to raise an engine from a car. The engine is raised 1.2 m with the pulleys when 4.8 m of rope is pulled through the pulleys.
A helicopter is initially moving at 9 m/s to the left. It then accelerates at 4 m/s2 to the right for 2 s. How far does it travel during the 2 s
A space station is constructed in the shape of a hollow ring of mass 6.00 x 10^4 kg and radius 130 m. how much work is done to get the space station spinning
An ac generator with a frequency of 1.54kHz and an rms voltage of 22.2V is connected in series with a 1.90k, What is the power factor for this circuit
When water freezes, it expands about 8.95%. What would be the pressure increase inside your automobile's engine block if the water in it froze
While visiting Planet Physics, you toss a rock straight up at 11m/s and catch it 2.7s later. While you visit the surface, What is the mass of Planet Physics
A tennis player receives a shot with the ball (0.0600 kilogram) traveling horizontally at 58.0 m/s and returns the shot with the ball traveling horizontally at 34.0 m/sin the reverse direction. Estimate what work does the racket do on the ball
A steel wire in a piano has a length of 0.60- m and a mass of 4.5 x10-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C (fC = 261.6 Hz on the chromatic musical scale).
A beam of pions (Pi-mesons, with rest energy m(Pi)c^2=140 MeV) consisting of 10^10pions/cm^2s moves with speed such that the total energy of each pion is 10^5 MeV. What is the pressure the beam exerts on a surface that absorbs it and brings it to res..
A cup of hot coffee is placed inside a large, well-insulated container. Over a five minute period, the entropy of the cup decreases by 100 J/K. What can you say about the entropy of the air surrounding the cup?
A 2.1-m-tall, 90-cm-diameter concrete column supports a 4.0×10^5kg load. By how much is the column compressed
When photons with 7.2 electron volts of energy strike a certain metal surface, it is found that the stopping potential is 1.7 electron volts. The work function of the metal surface is
A rotating cylinder about 16 km in length and 7.0 km in diameter is designed to be used as a space colony. With what angular speed must it rotate
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