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A person is standing 2.25 meters from a shining buidling, holding a balloon which is floating 2.55 meters directly above his eyes. What is the distance from his eyes to the image of the balloon he sees reflected off the side of the building?
The glow-in-the-dark dials on some watches and some keychain lights shine with energy provided by the decay of radioactive tritium, 3^1H. What is the speed of the emitted electron
A hockey puck is sliding across a frozen pond with an initial speed of 9.7 ms. It comes to rest after sliding a distance of 44.0 m. What is the coefficient of kinetic friction between puck and ice.
If the sprinter from the previous problem accelerates at that rate for 20 m, what will be his time for the race
A typical GPS (Global Positioning System) satellite orbits at an altitude of 4.40 107 m. Find the orbital period of such a satellite
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. Determine the angular speed of the sphere about its center at the bottom of the incline
A small marble is dropped from a height of 12 m and comes to rest after penetrating2.3 cm into sand. A) Determine the marble's impact speed at the sand's surface. B) Determine the marble's deceleration while impacting with the sand.
when a parachute opens the air exerts a large drag force on it. this upward force is initially greater than the weight
How man electrons are present in a 1.5C charge? Determine the mass of the 1.5 C charge. 1e=9.1x10^-31kg. determine the resistivity constant if the wire has a cross sectional area of 2x10^-5 m^2
Three resistors with values 1.0 , 2.2 , and 5.5 , respectively, are connected in parallel in a circuit with a 5.0 V battery. What is the total equivalent resistance
At t=0 a grinding wheel has an angular velocity of 21.0rad/s . It has a constant angular acceleration of 35.0rad/s^2 until a circuit breaker trips at time t = 2.50s. What was its acceleration as it slowed down
A 1.6-cm-tall object is 30cm to the left of a lens with a focal length of 15cm . A second lens with a focal length of 42cm is 58cm to the right of the first lens, Calculate the image height
Forensic scientists can measure the muzzle velocity of a gun by firing a bullet horizontally into a large hanging block that absorbs the bullet and swings upward. What was the original speed of this bullet
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