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A 180kg load is moved 23m vertically with an acceleration a=0.150g by a single cable. Determine: a. the tension in the cable b. the net work done on the load c. the work done by the...

A 75kg hiker, originally 1200m above sea level climbs a 6300m tall mountain. a) How much work does the climber do? b) If the body is only 20% efficient in converting the energy stored in fat...

A 300kg piano slides 4.5m down a 25° incline and is kept from accelerating by a man pushing back on it parallel to the incline. The coefficient of kinetic friction is 0.4 Calculate: a. the...

1. Find the resistance of a 30 meter length of copper wire of 0.8 mm diameter. 2. How hot would a copper wire need to be for its resistance to be 3% larger than its value at room temperature (20ºC)...

A rock is thrown (not dropped) straight down from a bridge into the river below. What is the magnitude of rock's acceleration immediately after being released? Disregard air resistance. a)...

A speed skater moving across frictionless ice at 5.0m/s hits a 3.0-m-wide patch of rough ice, she slows steadily, then continues on at 3.7m/s. What is her acceleration on the rough ice? Use 2 significant...

A toy train is pushed forward and released at 2.0m with a speed of 0.5 m/s. It rolls at a steady speed for 2.0s, then one wheel begins to stick. The train comes to a stop at 5.0m from the point at...

Two point charges, Q1 = 3.7 μC and Q2 = -1.3 μC, are placed on the x axis. Suppose that Q2 is placed at the origin, and Q1 is placed at the coordinate x1 = -5.0 cm. (a) At what point(s) along...

A large electroscope is made with "leaves" that are 78-cm-long wires with tiny 47 g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires...

The charge on a capacitor increases by 18 μC when the voltage across it increases from 93 V to 118 V. What is the capacitance of the capacitor?

The electric field between the plates of a paper-separated (K=3.75) capacitor is 8.25×104 V/m. The plates are 2.15 mm apart, and the charge on each plate is 0.670 μC.   (a) Determine...