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A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration a = (4.40 m/s2)i + (7.00 m/s2)j. At time t = 0, the velocity is (4.2 m/s)i. What are magnitude and angle of its velocity when it has been displaced by 11.7 m parallel to the x axis?
In redesigning a parallel-plate capacitor with circular plates, you triple both the diameter of the plates and their separation. what is the capacitance of the redesigned capacitor
A hospital patient has been given 131-I (half-life = 8.04 days) which decays at 6.2 times the acceptable level for exposure to the general public
He is sitting on a set of bathroom scales. He notes that scales show four times his normal weight. What is the radius of the loop, in meters.
A telescope can be used as a camera if the film is placed at the image position of the objective lens (or mirror); what is the angular separation of the two stars
A proton with an initial speed of 800000 m/s is brought to rest by an electric field. What was the potential difference that stopped the proton
Consider a book of mass 10 kg on a frictionless incline that makes an angle of 40? with the horizontal. Find the acceleration of the book down the incline
The moon is observed using a telescope that has an objective lens with a focal length of 3.0 m and an eyepiece with a focal length of 7.5 cm. What is the angular diameter of the moon
A 13.9-kg object hangs in equilibrium at the end of a rope (taken as massless) while a wind pushes the object with a 66.5-N horizontal force. determine the rope\'s angle from the vertical
Body fat has an energy content of about 38,000 Joules per gram. Suppose your weight has been constant, how much weight will you have gained
The stationary siren on a firehouse is sounding at 85 Hz. What is the frequency received by a firefighter racing toward the station with a speed of 108km/h?
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 4.00 m/s2. If the ramp has a length of 5.90 m, how long does it take the puck to reach the bottom
A certain atom of has 81 protons. Assume that the nucleus is a sphere with radius 6.99 fm, compute the magnitude of the electric field produced by the protons
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