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A boy stands at the peak of a hill which slopes downward uniformly at angle φ. At what angle θ from the horizontal should he throw a rock so that it has the greatest range?
A 91 g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 78 cm. Illustrate what is the speed of the arrow as it leaves the bow?
An electric trimmer blade has rotational inertia 2.00×10?4kg?m2. How much work was done to accelerate the blade
A BB gun shoots pellets so that their velocity is given by v = (-5.00 107) t 2 + (2.80 105) t, Determine the length of time the pellet is accelerated
Each has a charge of +e. The length of one side of the square is L. What is the net electric potential caused by the two positive ions at both of the empty corners of the square
A parallel-plate air capacitor has a capacitance of 400pF and a charge of magnitude 0.250microC on each plate. The plates are 0.500mm apart. What is the surface charge density on each plate
Suppose you have a lens system that is to be used primarily for 770 nm light. What is the second thinnest coating of fluorite that would be nonreflective for this wavelength
On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.650m from the axis of rotation of the stool. Compute the kinetic energy of the system after the dumbbells are pulled in
A 29 g rifle bullet travelling 270 m/s buries itself in a 3.50 kg pendulum hanging on a 2.6 m long string, which makes pendulum swing upward in an arc. Find out the horizontal component of the pendulum's displacement.
A cell membrane has a surface area of 1.0 x 10^-7 m^2, a dielectric constant of 5.6 and a thickness of 8.5 nm. How much energy is stored in this capacitor
An electric motor is plugged into a standard 120V electrical service. At startup a current of 23.4A is measured. what is the operating current with the new resistor added
An object weighing 347 N in air is immersed in water after being tied to a string connected to a balance. Calculate the density of the object
A point P is on a rim of a wheel of radius 2.0m. At time t=0 wheel is at rest and P is on the x-axis. The wheel undergoes a uniform angular acceleration of 0.01 rad/s2 about the center O. Find out the time t, when P returns to an original position on..
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