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A softball having a mass of 0.40 kg is pitched horizontally at 120km/h . By the time it reaches the plate, it may have slowed by 11% .
Neglecting gravity, estimate the average force of air resistance during a pitch, if the distance between the plate and the pitcher is about 15m .
Your friend's car is parked on a cliff overlooking the ocean on an incline that makes an angle of 22.1° below the horizontal. Find the car's position relative to the base of the cliff
Two identical positive charges exert a repulsive force of 6.6 x10-9 N when separated by a distance of 5.4 10-10 m. what is the charge of each.
A 25,000-kg subway train initially traveling at 10.5 m/s slows to a stop in a station and then stays there long enough for its brakes to cool. The station's dimensions are 67.0 m long by 18.5 m wide by 12.5 m high.
a pair of hedge trimmers are 45 cm long from the pivot to the end of the handles. if the person applies of a force of
To get up on the roof, a person (mass 70.0 kg) places a 6.00-m aluminum ladder (mass 10.0 kg) against the house on a concrete pad with the base of the ladder 2.00 m from the house. calculate the magnitudes of the forces on the ladder
A very thin sheet of plastic (n=1.60) covers one slit of adouble-slit apparatus illuminated by 640-nm light, What is the (minimum) thickness of the plastic
A middle-aged man starts to wear eyeglasses with lenses of +2.0 D that allow him to read a book held as close as 25 cm. Several years later, What is the power of the new lenses
A playground is on the flat roof of a city school, 5.4 m above the street below (see figure). The vertical wall of the building is h = 6.90 m high, forming a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a pa..
3.09 moles of neon, a monatomic gas, starts out at conditions of standard temperature and pressure. The gas is heated at constant volume until its pressure is tripled, then further heated at constant pressure until its volume is doubled. Assume that ..
In an L-R-C series circuit, the resistance is 420 ohms, the inductance is 0.340 henrys, and the capacitance is 1.80×10?2 microfarads. What is the resonance angular frequency of the circuit
a parallel plate capacitor with plates of area 500 cm2 is charged to a potential difference v and is then disconnected
A trap door, of length and width 2.35 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
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