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Irina standing on the edge of a cliff throws a stone at 40 degree angle above the horizontal with an initial speed of 10.0 m/s. The instant before the stone hits the ground below, it is traveling at a speed of 42 m/s. If Irina were to throw the other rock at 40 degree angle below the horizontal from the cliff instead, with the same initial speed of 10.0 m/s, what is the magnitude of the velocity of the stone just before it hits the ground? Ignore any effects of air resistance.
The amplitude of a driven harmonic oscillator reaches a value of 25.0 F0/m at a resonant frequency of 400 Hz . What is the Q value of this system?
a wall clock has a minute hand with a length of 0.49 m and an hour hand with a length of 0.26 m. take the center of the
A football is kicked 50.4 meters. If the ball is in the air 4.54 s, with what initial velocity was it kicked
A machine shop has 129 equally noisy machines that togetherproduce an intensity level of 90 dB. how many machines must be turned off
A 1.80 mH inductor is connected in series with a dc battery of negligible internal resistance, a 0.840 k-ohm resistor, and an open switch. How long after the switch is closed will it take for the current in the circuit to reach half of its maximum..
A 150-g aluminum cup contains 900 g of water in thermal equilibrium with the cup at 85°C. The combination of cup and water is cooled uniformly so that the temperature decreases by 1.6°C per minute. At what rate is energy being removed? Express your a..
find the angle between the position vectors to the points 3 -4 0 and -2 1 0 and find the direction cosines of a vector
A 200.0 m long thin wire carries a line charge density ! = 358.0 nC/m. Find the potential difference between points 5.0 m and 6.0 m on a perpendicular radius to the axis of the wire, provided the perpendicular radius is not near either end of the ..
A rocket in a fireworks display explodes high in the air. The sound spreads out uniformly in all directions. The intensity of the sound is 2.30 10-6 W/m2 at a distance of 110 m from the explosion. Find the distance from the source at which the int..
A point charge q = +39.0 μC moves from A to B separated by a distance d = 0.183 m in the presence of an external electric field E with arrow of magnitude 255 N/C directed toward the right as in the following figure. Find the electric force exerted..
calculate the overall magnification of a compound microscope that uses an objective lens with a focal length of 0.50 cm
An inductor (L = 400 mH), a capacitor (C = 4.43 F), and a resistor (R = 500 ?) are connected in series. A 50.0-Hz AC source produces a peak current of 250 mA in the circuit. (a) Calculate the required peak voltage Vmax. (b) Determine the phase ang..
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