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Although the altitude may vary considerably, hailstones sometimes originate around 500m (about 1500ft) above the ground.
a) Neglecting air drag, how fast will these hailstones bemoving when they reach the ground, assuming that they started fromrest? Express your answer in m/s and in mph.
How many kilocalories of heat are produced when the brakes are used to bring a 930 kg car to rest from a speed of 102 km/h.
You shoot a 47-g pebble straight up with a catapult whose spring constant is 310 N/m. How high above the starting point does the pebble fly
A particle undergoes a displacement Δr of magnitude 57 m in a direction 25° below the x axis. Express Δr in terms of the unit vectors x and y.
A sphere of mass of m = 1.30 kg is first placed directly on the plate of an electronic scale. Calculate the density of the sphere
at one time television sets used rabbit-ears antennas. such an antenna consists of a pair of metal rods. the length of
The drawing shows an equilateral triangle, each side of whichhas a length of 4.74 cm. Point charges are fixed to each corner, asshown. The 4.00 C charge experiences a net force due to the chargesqA and qB.
In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. Find the magnitude of the total acceleration of the ball
q1. a spring with spring constant 12.5 hangs from the ceiling. a 400 ball is attached to spring and allowed to come to
They then turn together around the spindle with their centers superposed. What is an angular frequency in of the combination.
Force F = (-9.0 N) i + (5.0 N) j acts on a particle with position vector r = (-5.0 m) j + (1.0 m) k. What is the torque on the particle about the origin
A 5.6cm diameter horizontal pipe gradually narrows to 4.6cm . When water flows through this pipe at a certain rate, What is the volume rate of flow
A submarine is 319 m horizontally out from the shore and 111 m beneath the surface of the water. A laser beam is sent from the submarine so that it strikes the surface of the water at a point 209 m from the shore.
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