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A 4.00-kN piano is lifted by three workers at a constant speed to an apartment 27.6 meter above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 177 Watt of power, and the pulley system is 75 percent efficient (thus that 25 percent of the mechanical energy is lost due to friction in the pulley). Ignoring the mass of the pulley, determine the time required to lift the piano from the street to the apartment.
Large insects such as locusts can jump as far as 75cm horizontally a level surface. An entomologist analyzed a photograph and found that the insects launch angle was 55 degrees. What was the insect's initial velocity?
An 815-kg race car can drive around an unbanked turn at a maximum speed of 61 m/swithout slipping. The turn has a radius of curvature of150 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of2500 N on the ..
Johnny is running home from school to watch his favorite soap opera, "As the Stomach Turns". what direction is Johnny's home from school
in the electron gun pictured a potential difference of 12.0 kv is found to bring electrons from rest at the cathode to
A 7.28-%u03A9 resistor is connected across a 9.00-V battery. The voltage between the terminals of the battery is observed to be only 7.27 V. obtain the internal resistance of the battery
A sphere of copper is subjected to 146.9 MPa of pressure. The copper has a bulk modulus of 130 GPa. By what fraction does the volume of the sphere change
question a train locomotive is pulling two cars of the same mass behind it. determine the ratio of the tension in the
Figure the y-component of the magnetic force acting on a segment of wire of length L = 21.0 cm
q1. a professors office door is 0.80 wide 3.0 high and 5.0 thick has the mass of 25 and pivots on frictionless hinges.
A rod is being used as a lever, as shown in the figure below. The fulcrum is x1 = 1.79 m from the load and x2 = 3.81 m from the applied force. If the load has a mass of 12.8 kg, what force must be applied to lift the load?
A sample of ore containing radioactive strontium9038Sr has an activity of 7.6 x 105 Bq. How many grams of strontiumare in the sample
Light is observed to converge to a point after being reflected froma plane mirror. Were the incident rays parallel, converging,or diverging prior to striking the mirror? Show a diagram to proveyour conclusion.
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