Six months of darkness at the South Pole begins when the Sun is at the
a. winter solstice.
b. summer solstice.
c. autumnal equinox.
d. vernal equinox.
d
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Magnetic Field of a Long Wire: In the figure, the two long straight wires are separated by a distance of d = 0.40 m. The currents are I1 = 1.0 A to the right in the upper wire and I2 = 8.0 A to the left in the lower wire. What are the magnitude and direction of the magnetic field at point P, that is a distance d/2 = 0.20 m below the lower wire? (?0 = 4? × 10-7 T ? m/A)
What will be an ideal response?
A bullet of mass 0.010 kg and speed of 200 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. This process takes 0.02 second. The magnitude of the impulse delivered to the bullet by the block during this time is
A. 0.98 N. B. 2.0 Ns. C. 1.0 Ns. D. zero. E. 4.0 Ns.
A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the speed of the rock as it hits the ground?
a. 30 m/s c. 34 m/s b. 32 m/s d. 36 m/s
A projectile is fired into the air at an angle of 50° above ground level and hits a target downrange. It will also hit the target if fired at an angle of
A) 40°. B) 45°. C) 55°. D) 60°. E) none of the above