Earth's mantle is
a. metallic.
b. very dense gas.
c. solid.
d. liquid.
c
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A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
a. 0.60 mT b. 0.85 mT c. 52 ?T d. 0.40 mT e. 0.75 mT
An up quark (u) has a charge of +2/3 and a down quark (d) has a charge of ?1/3. Which of the following describes a neutron?
A) uuu B) uud C) udd D) ddd
A particle (q = -4.0 mC, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2 . What is the magnitude of the magnetic field?
a. 5.3 mT b. 4.9 mT c. 5.1 mT d. 4.7 mT e. 3.6 mT
A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg
The seal grabs onto the whale and holds fast. What is the momentum of these two sea creatures just after their collision? You can neglect any drag effects of the water during the collision. A) 0.00 kg ? m/s B) 1200 kg ? m/s C) 2000 kg ? m/s D) 7200 kg ? m/s E) 6000 kg ? m/s