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The force constant of a spring is 800 N/m and the unscratched length is 0.63 m. A 4.6 kg block is suspended from the spring. An external force slowly pulls the block down, until the spring has been stretched to a length of 0.76 m. The external force is then removed, and the block rises. When the spring has contracted to a length of 0.66 m, the acceleration of the block, including direction, is closest to?
Two slits with a separation of 8.5 x 10-5 cm create an interference pattern on the screen 2.3 m away. what is the wavelength of the light used
An "energy bar" contains 18g of carbohydrates. If the energy bar was his only fuel, how far could a 68kg person walk at 5km/hr
rita accelerates a 0.40 kg ball from rest to 9.0 ms during the 0.15 s in which her foot is in contact with the ball.
A hollow cone (like a party hat) has vertex angle 2?, slant height L, and surface charge density ?. It spins around its symmetry axis with angular frequency ?. What is the magnetic field at the ti
a 35 kg uniform ladder is leaned against a building. the 5 m tall ladder makes an angle of 60 degrees with the ground.
When light of wavelength 350 nm falls on a potassium surface, electrons are emitted having a maximum kinetic energy when the stopping voltage, Vs = 1.30 V. Find Work function of potassium and The cut-off wavelength.
A ski starts from rest and slides down a 29° incline 100 mlong. Use energy methods. what is the ski's speed at the base of the incline
A particle is moving around in a circle and its position is given in polar coordinates as x = Rcos?, and y = Rsin?, derive the equation for centripetal acceleration
The moon has a period of 27.3 days and a mean distance of 3.90x10^5km from the center of earth. A)use keplers laws to find the periodof a satellite in orbit 6.70x10^3 km from the center of earth. B)how far above earth's surface is the satellite?
A transformer on a pole near a factory steps the voltage down from 3600 V (rms) to 120 V (rms). evaluate the current in the secondary
A cube of metal has a mass of .347 kg and measures 3.21 cm on each side. Determine the density of the cube in kg/m^3
a given capacitor is connected to a 12.0 v battery and when fully charged stores 3.67 x 104 j of energy. if the plate
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