In space, a 4.0 kg metal ball moving 30. m/s has a head-on collision with a stationary second ball of equal mass. After the elastic collision, what are the velocities of the balls?
What will be an ideal response?
They exchange velocities: the first becomes zero, and the second acquires 30. m/s in the direction the first was moving.
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___________ can be used to determine the galaxy's mass if the galaxy is reasonably close so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center
a. The Hubble constant b. A galaxy's color c. A galaxy's rotation curve d. A galaxy's diameter e. The velocity dispersion method
Conversion of Units: In a country where the unit of currency is the Passi, kerosene costs 130 Passi per liter, and one dollar buys 227 Passi. What is the cost of kerosene in dollars per gallon? (1.00 gal = 3.79 L)
Fill in the blank(s) with the appropriate word(s).
The rule for the interaction of magnetic poles is similar to the rule for electric
A) circuits. B) polarization. C) charges.
A proton having a speed of 3.0 × 106 m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field. What is the magnitude of the magnetic field? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A) 0.080 T B) 0.16 T C) 0.24 T D) 0.32 T E) 0.36 T