The motion of a particle connected to a spring is described by x = 10 sin (pt). At what time (in s) is the potential energy equal to the kinetic energy?
a. 0
b. 0.25
c. 0.50
d. 0.79
e. 1.0
B
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One mole of an ideal gas is held at a constant volume of 1 liter. Find the change in pressure if the temperature increases by 50°C
a. 3 atm b. 4 atm c. 2 atm d. 1 atm e. 5 atm
A watch dial that continues to glow after a week in the dark is almost certainly
A) fluorescent. B) phosphorescent. C) polarized. D) radioactive.
Magnetic Field of a Current Loop: A flat circular coil having 57 turns of very thin wire has a diameter of 9.5 cm and carries 7.2 A of current. (?0 = 4? × 10-7 T ? m/A)(a) What is the strength of the magnetic field at the center of the coil?(b) If the same length of wire were used to make a coil with twice the original diameter, how large would the magnetic field at the center be when it carried the same current as before?
What will be an ideal response?
Like the Sun and the Moon, the planets appear to move from west to east from one day to the next
Indicate whether the statement is true or false