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A (smooth) rope of length L and mass m is placed above a hole in a table. One end of the rope falls through the hole, pulling steadily on the remainder of the rope.Ignore friction of the rope as it unwinds. Find the mechanical energy lost from the rope as the end of the rope leaves the table. Note that the rope length is less than the height of the table.
what is the diameter of the copper rod. Pull horizontally on a crate with a force of 140 N and it slides across the floor in a dynamic equilibrium. How much friction is acting on crate.
A marble is thrown horizontally with a speed of 19.0 m/s from the top of building. When it strikes the ground, marble has a velocity that makes an angle 75° with the horizontal. From what height above the ground was the marble thrown.
What are the d irections of electric field
The two metal objects in the figure have net charges of +68 pC and -68 pC, which result in a 28 V potential difference between them, What is the capacitance in picofarads of the system
An LR circuit is hooked up to a battery as shown in the figure, with the switch initially open. The resistance in the circuit is R=120Ω, the inductance is L=4.10H, and the battery maintains a voltage of E=49V. At time t=0 the switch is closed.
You have a wire with a current that points upwards. If you put a compass east of that wire, how would the magnitude and direction of the total magnetic field change
A Carnot engine whose cold reservoir temperature is 1.0 C has a thermal efficiency of 40%. By how much should the temperature of the hot reservoir be increased to raise the efficiency to 60%?
In effect, the first circular dark fringe in the diffraction pattern defines the size of the central bright spot on the moon. find the diameter (not the radius) of the central bright spot on the moon.
Suppose the highway is icy and the coefficient of friction between the tires and pavement is only one-third what you found in part (1). What should be the maximum speed of the car so it can round the curve safely.
explain the energy released in the explosion. A rock stuck in the tread of a 59.0 cm diameter bicycle wheel has a tangential speed of 3.20 m/s. When the brakes are applied, the rock's tangential deceleration is 1.20 m/s^2
Write the expression of the force fl j corresponding to the Uu potential energy term. Derive the expression of the distance r m i n at which Uu has its minimum value, as a function of the parameters a and/or E.
Florence, who weighs 120 lbs, stands on a bathroom scale in an elevator. What would the scale read when the elevator is accelerating downward at 2m/s2.
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