The magnetic field at a distance of 2 cm from a current carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from the wire?
A) 1/2 µT
B) 1 µT
C) 2 µT
D) 4 µT
E) 8 µT
C
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A ____ is believed to occur when energy, stored in a twist in the solar magnetic field above a sunspot, is suddenly released
a. solar flare b. supergranule c. spicule d. coronal hole e. none of the above
Work-Energy Theorem: A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force. What is the cart's final kinetic energy?
A. 200 J B. 160 J C. 120 J D. zero
A bubble having a diameter of 1.00 cm is released from the bottom of a swimming pool where the depth is 5.00 m. What will the diameter of the bubble be when it reaches the surface? The temperature of the water at the surface is 20.0°C, whereas it is 15.0°C at the bottom. (The density of water is 1.00 × 10^3 kg/m3.)
a. 1.05 cm b. 1.15 cm c. 1.45 cm d. 1.65 cm e. 1.35 cm
A 30.00 kg box slides up a 12.00 meters long incline at an angle of 30.00 degrees above the horizontal. Friction is negligible. The change in gravitational potential energy is
A. 2110 J. B. 1467 J. C. 1080 J. D. 1764 J. E. 760.0 J.