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In the Olympiad of 700 BCE, athletes competing in the standing long jump used handheld weights called halters to lengthen their jumps. The weights were swung up in front just before liftoff and then thrown backward during the flight. Suppose a 78 kg athlete uses two 5.50 kg halters, throwing them horizontally to the rear at his maximum height. Let his liftoff velocity be V ?=(9.5i ?+4.0j ? ) m?s with or without the halters, and assume that he lands at the liftoff level. What distance would the use of the halters add to his range?
A bird (mass 31 g) is flying at 11.1 m/s when it flies into a glass window and bounces off at a speed of 4.1 m/s. What is the average force on the bird during the collision
A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 9:42. find the rms output voltage of the transformer
While taking a walk around your neighborhood, you see a flash of lightning hit the Earth in the distance. How far away did the lightning strike the ground
A square, 0.67 m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. What is the magnitude of the maximum torque
A jetliner is moving at a speed of 274 m/s. The vertical component of the plane's velocity is 54.0 m/s. Conclude the magnitude of the horizontal component of plane's velocity.
A standing wave on a string fixed at both ends has three antinodes. The string is 85.0 cm long. What is the wavelength of this standing wave
A proton is travelling to the right at. It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What are the speeds of each after the collision? What is the direction of the pro..
A bicyclist is heading east at 6.6 m/s for 2.5 minutes when she realizes she left her cell phone in her apartment. What is her average speed and velocity for the round trip
An object is initially placed on the optical axis 27.1 cm to the left of a convex lens that has a focal length of 14.7 cm. The image is real and inverted. what is the new image distance
A beam of hydrogen molecules (H2) is directed toward a wall, at an angle of 68 ° with the normal to the wall. What is the beam's pressure on the wall
at what distances from the speaker do you hear a minimum sound intensity.
What is the frequency of sound put out by the engine of a car moving at 90km/hr if its four-cylinder engine makes 2000 revolutions per kilometer
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