To measure the mass of a planet with the same radius as earth, an astronaut drops an object
from rest (relative to the planet) from an altitude of one radius above the surface. when the
object hits its speed is 4 times what it would be if the same experiment were carried out for
earth. in units of earth masses, the mass of the planet is:
a. 2
b. 4
c. 8
d. 16
e. 32
ans: d
Answers: 2
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Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?
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Tara goes on a camel safari in africa. she travels 5 km north, then 3 km east and then 1 km north again. what distance did she cover? what was her displacement?
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Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery
Answers: 1
To measure the mass of a planet with the same radius as earth, an astronaut drops an object
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