Earth's core is believed to be composed of
a. iron and nickel.
b. silicate rocks.
c. carbon and silicon.
d. uranium and lead.
a
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A projectile starts at the coordinate origin, where the displacement vector also originates. The initial velocity, v0, makes an angle ?0 with the horizontal where 0
A.
is parallel to 
.B.
is perpendicular to .C.
is parallel to 
.D.
is perpendicular to .E.
is perpendicular to .A light bulb, sold as long-lasting, is rated 120 W at 130 V. The "increased" lifetime comes from using it at 120 V. Assuming negligible change in resistance at the different voltage, what is its power consumption at 120 V?
a. 92 W c. 108 W b. 102 W d. 85 W
Parallel Wires: Two long parallel wires are 0.400 m apart and carry currents of 4.00 A and 6.00 A. What is the magnitude of the force per unit length that each wire exerts on the other wire? (?0 = 4? × 10-7 T ? m/A)
A. 2.00 ?N/m B. 5.00 ?N/m C. 12.0 ?N/m D. 16.0 ?N/m E. 38.0 ?N/m
Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rachel's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year)
According to Rachel, how long does the trip take? A) 14 years B) 15 years C) 11 years D) 4.2 years E) 23 years