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During a violent storm, the wind over a flat, 200 m2 roof has a velocity of 10 m/s. What is the net force on the roof? (Pair=1.29 kg/m3)
An electric vehicle starts from rest and accelerates at a rate of 1.7 m/s2 in a straight line until it reaches a speed of 27 m/s. How much time elapses from start to stop
A 0.15 kg ball is placed in a shallow wedge with an opening angle of 150.For each contact point between the wedge and ball, find out the force exerted on the ball. Assume the system is frictionless.
A 4-kg rock is tied to the end of a string and twirled overhead, 1.7 m above the ground, in a 1.1-m radius, horizontal circle. How far away from its location when the string breaks will the rock hit the ground
A sphere is charged with electrons to ?1 × 10^-5 C. How many electrons make up this charge
A volleyball player's 3.7 kg arm moves at an average angular velocity of 15 rad/s during execution of a spike. what is the average radius of gyration for the arm during the spike
In order to measure the radial velocity of a star (the speed of motion towards or away from us) what type of instrument would be used and how would the data be used to derive the velocity?
Once free of this area, it speeds up to 13 m/s in 8 {rm s}. At the edge of town, driver again accelerates, with the same acceleration, for another 16 {rm s} to reach a higher cruising speed.
A Gas of diatomic molecules is in equilibrium at a temperature of 340K. what is the rms angular speed of the molocules
A car is driven 155 km west and then 75 km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
A Molecule of DNA is 2.17 um long. The ends of the molecule become strongly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.78% upon becoming charged. Determine the effective spring con..
A bartender slides a beer mug at 1.30 m/s towards a customer at the end of a frictionless bar that is 2.0m tall. The customer makes a grab for the mug and misses, and the mug sails off the end of the bar.
A diffraction grating produces a first-order maximum at an angle of 25.0 degree. What is the angle of the second-order maximum
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