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The Milky Way has a diameter (proper length) of about 1.2x105 light-years. According to an astronaut, how many years would it take to cross the Milky Way if the speed of the spacecraft is 0.890 c?
A nickel coin has a mass of about 5.172 g. Each mole (6.02 * 10^23 atoms) has a mass of about 57.98 g. Find the number of atoms in nickel coin. Find the number of electrons in the coin. Each nickel atom has 28 electrons/atom.
a 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.02 atm and a volume of
A 100-coil spring has a spring constant of 380 N/m. It is cut intofour shorter springs, each of which has 25 coils. What is the angular frequency of the motion
A woman stands on a scale in a moving elevator. Her mass is 60 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest the elevator accelerates upward. Through the acceleration there is a tension of 9410 Newton..
An airplane propeller is rotating at 1900 rpm. What is the period ( in seconds) of this propeller
An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. how much kinetic energy did each piece acquire
At what speed does the speed of the ball change relative to the cab floor (sign and magnitude)?
A Ferris wheel starts at rest and builds up to a final angularspeed of 0.60 rad/s while rotating through an angular displacementof 3.9 rad. What is its average angular acceleration
consider the interface between atmospheric air and a body of water both at 17 degc.a. what are the mole and mass
A clarinetist, setting out for a performance, grabs his 3.19-kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 36.0 N. Find the case\'s vertical acceleration
A copper rod has a length of 1.8 m and a cross-sectional area of 4.0 × 10-4 m2. What is the mass of ice per second that melts
A - 5.00 nC point charge is on the x axis at x = 1.20 m . A second point charge Q is on the x axis at -0.600m. a) What must be the sign and magnitude of Q for the resultant electric field at the origin to be 45.0N/C in the + x direction?
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