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A soccer player kicks a ball from ground level with an initial velocity of 25 m/s at an angle of 30° above the horizontal. In all calculations, treat gravitational acceleration as g = 10 m/s2.After 2.0 s, how many meters above the projection point is the ball?
The impact of the head of a golf club on a golf ball can be approximately regarded as an elastic collison. what must the speed of the club be before impact
A pyramid with horixontal square base, 5.5 m on each side, Calculate the total electric flux through the pyramid four slanted surfaces
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
A piece of wood is 0.640m long, 0.230m wide, and 7.00×10^?2 m thick. What is the mass of this volume of lead
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. How many electrons pass through the wires connected to the patient
What is the distance between the particles at this time? The Coulomb constant is 8.95755 × 109 N • m2/C2, the elemental charge is 1.6721 × 10-19 C, and the acceleration due to gravity is 9.8 m/s2.
A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. What is the moment of inertia of the wheel
A 150-? resistor is connected in series with a 0.250-H inductor. The voltage across the resistor is vR=(3.80V)cos[(720rad/s)t]. Derive an expression for the circuit current
As part of the safety investigation, two 1400 {rm kg} cars travelling at 23 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.7 {rm s} to stop, and (b) car that hits..
q1. a football spends a total of 5 seconds in the air. it reaches a peak height of 30 meters. how long does it take to
The specific heat of a certain metal can be determined by measuring the temperature change that occurs when a piece of the metal is heated, What is the specific heat of the metal
7.03 g of phosphorus reacts with bromine to form 61.39g of phosphorus tribromide, How many grams of bromine reacted in this reaction
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