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Suppose that we are able to travel past the Earth in a straight line. We travel a distance 4.01×107 m at a speed of 0.9007 c. (a) How long would this take as measured by someone standing on the Earth? (b) How long would this take as measured by us in our moving reference frame?
A person pushes a 16.2-kg shopping cart at a constant velocity for a distance of 27.5 m on a flat horizontal surface. She pushes in a direction 32.3 ° below the horizontal. A 35.3-N frictional force opposes the motion of the cart. (a) What is the mag..
Suppose a 76 kg person hangs vertically from a nylon rope. What radius must the rope have if its fractional enhancement in length is to be the similar as that of the spider's thread.
A 475 kg concrete beam should be raised by a 10.0 m from the ground. How much power is needed to do the job in 24 s
A 3000mL flask is initially open to air at 22°C and 1atm pressure. It's then closed and immersed in boiling water. How many moles escape when the air is released
Light of wavelength 589 nm is used to view an object under a microscope
A hot-air ballonist rising vertically with a constant velocityof 5.00 m/s releases a sandbag at an instant when the balloon is40m above the ground. With what magnitude of velocity does it strike
At one instant, a system has 30J of kinetic energy and 30J of potential energy. How much work was done by conservative forces
A student is reading a lecture written on a blackboard. If the writing on the blackboard is 4.84 cm high, what is the height of the image on her retina
A uniform 2.95- kg spinning disk with a radius of 0.263 m is brought to rest by a brake-pad pressed against the side 0.205 m from the rotation axis. What frictional force was applied by the brake pad
A girl is standing at the edge of a cliff 145 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.79 m/s. How long does it take the rock to hit the ground
If a Mack truck with a mass mt = 20000 kg and a Honda Civic with a mass of mc=2000 kg have a head on collision and force upon the Mack truck is 1000 N
Gold has a molar mass of 197 g/mol. How many moles of gold are in a 9.09 g sample of pure gold, How many atoms are in the sample
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