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in hot-air ballooning a large balloon is filled with air heated by a gas burner at the bottom why must the air be
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an asteroid is discovered in a nearly circular orbit around the sun with an orbital radius that is 275 times earths
on a hot summer day 30 degrees celsius a pesky little mosquito produced its warning sound near your ear the sound is
a uniform disk of mass m 16 kg and radius r 018 m rotates counterclockwise at a constant rate of 36 revs about its
a loop of wire in the shape of a rectangle of width 8 cm and length 90 cm and a long straight wire carrying acurrent i
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three moles of an ideal monatomic gas expands at a constant pressure of 290atm the volume of the gas changes from
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a horizontal disk with a moment of inertia of 10 kg square meters relative to a vertical frictionless axis through its
a device consisting of four heavy balls connected by low mass rods is free to rotate about an axle it is initially not
one end of a 33cm long aluminum rod with a diameter of 28 is kept at 420c and the other is immersed in the water at
a physics lecture room has a volume of 254 m3a for a gas pressure of 100 atm and a temperature of 270 oc use the ideal
the average speed of the atoms in a 39 g sample of helium gas is 607 ms estimate the thermal energy of the
a police car is moving at 38msec to catchup with a speeder directly ahead the speed limit is 291 msec police car
the box of a well-known breakfast cereal states that one ounce of the cereal contains 99 calories 1 food calorie 4186
a converging lensf14 cm is located 8 cm to the left of a diverging lens f2 -2 cm an object is placed 6 cm to the left
the magnetic field 450 cm away from a long straight wire carrying current 800 a is 200 microta at one instant the two
a sound wave travels twice as far in neon ne as it does it krypton kr in the same time interval both neon and krypton
a 45- kg block oscillates with an amplitude of 0070 m on a light spring of constant k 290 nm what is the maximum value
a sealed container with a metal bottom contains m0020kg of ice at ti243k and is brought into thermal contact with n040
a 150- resistor is connected in series with a 0250-h inductor the voltage across the resistor is vr 570 vcos445 radsta
a copper-constantan thermocouple generates a voltage of 455 10-3 volts when the temperature of the hot junction is
a chamber with a fixed volume of 10 m3 contains a monatomic gas at 300 102 k the chamber is heated to a temperature of
three moles of an ideal monatomic gas expands at a constant pressure of 200atm the volume of the gas changes from