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A spacecraft is in orbit around a planet. The radius of the orbit is 3.0 times the radius of the planet (which is R = 71497 km). The gravitational field at the surface of the planet is 23 N/kg. What is the period of the spacecraft's orbit? [Hint: You don't need any more data about the planet to solve the problem.]
a rectangular wooden slab with length =2.0m, width=2.0m, and height=1.0m is used as a floating device in a play water pond. find the distance from the top of the wood to the water surface
A marble is thrown horizontally with a speed of 19.0 m/s from the top of building. When it strikes the ground, marble has a velocity that makes an angle 75° with the horizontal. From what height above the ground was the marble thrown.
A 7.4muC charge and a -4.3mC charge are inside an uncharged sphere. What is the electric flux through the sphere
A cat rides a merry-go-round while turning with uniform circular motion. At time t1 = 2.00 s, the cat's velocity is v1 = (5.50) i + (4.00 m/s) j, What is the magnitude of the cat's centripetal acceleration
A ship is floating on a lake. Its hold is the interior space beneath its deck; the hold is empty and is open to the atmosphere. What volume of water per second leaks into the ship
Find the period of a child's leg as it swings about the hip joint. Assume the leg is 0.39 m long and can be treated as a uniform rod, Estimate the child's walking speed
For a safe re-entry into the Earth's atmosphere, the pilots of a space capsule must reduce their speed from 2.6 × 104 m/s to 1.1 × 104 m/s. For how long must they fire their engine
In Mexico, a courageous diver runs horizontally off the edge of a sea side cliff 48.8 m above the sea (about six stories high). Calculate her speed and direction angle of her velocity as she hits the water(or rocks)
The potential difference between two parallel plates is 566 V. An alpha particle with mass of 6.64 10, What is the speed of the alpha particle when it reaches the other plate
A solenoid is designed to produce a 2.74*10^-2T magnetic field near its center. It has a radious of 1.25cm and a length of 45.0 cm, how many turns must the solenoid have
A spring stretches by 0.0241 m when a 4.15-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 4.44 Hz
A commuter train blows its horn as it passes a passenger platform at a constant speed of 60.0 m/s. What is the frequency observed by a person on the platform as the train approaches
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