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A speeder is pulling directuly away and increasing his distancefrom a police car that is moving at 25m/s with respect to theground. The radar gun in the police car emits an electromagneticwave with a frequency of 7.0 x 109 Hz. The wave relects from the speeder's carand returns to the police car, where its frequency is measured tobe 320 HZ less than the emitted frequency. Find the speeder's speedwith respect to the ground.
A 102-N grocery cart is pushed 13.0 m by a shopper who exerts a steady horizontal force.
What is the magnitude of the free-fall acceleration of a ball (mass m) due to the Earth's gravity at an altitude of 7R, where R is the radius of the Earth
You hold a 23.5-kg car tire in your hand and, standing in place, rotate the tire in a horizontal circle of radius r = 1.10 m starting from rest. What is the time required to complete three full revolutions
A wheel 45.0 cm in diameter accelerates uniformly from 206rpm to 340 rpm in 7.0 s. How far will a point on edge of the wheel have travelled in this time.
A 435 kg car moving at 20.0 m/s hits from behind another car moving at 9.0 m/s in the same direction. what is the velocity of the first car after the collision
Speedboat A negotiates a curve whose radius is 115 m. Speedboat B negotiates a curve whose radius is 194 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
Take element Z = 70 from the periodic table. Ionize it 69 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron?
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
A horizontal plank of mass m and length L is pivoted at one end. The plank's other end is supported by a spring of force constant k. Find the angular frequency (omega) of simple harmonic motion
A 1.0-cm-tall object is 7.5 cm in front of a diverging lens that has a 10 cm focal length. Determine the image height by making measurements on your diagram
Chuck Norris's razor blade has an output force of 2500 lbs is used to shear his burley face. The shaving blade has the 0.35 inch thick blade with a 55 degree slope.
On the planet Zardem, the standard unit of time is the Zarsec, or Zs, where 1 Zs = 2.2s. how fast is the runner traveling
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