A net force acting on an object will always cause a change in the object's
A) momentum.
B) speed.
C) mass.
D) direction.
A
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Which main sequence stars have the shortest lifetimes?
A) spectral type M B) spectral type G C) spectral type O D) spectral type A E) can't tell from information provided
A magnet on a frictionless mount would have its magnetic north pole point toward the Earth’s geographic
A. south pole B. north pole
A ball is projected upward at time t = 0.00 s, from a point on a roof 70 m above the ground and experiences negligible air resistance. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 28.5 m/s
Consider all quantities as positive in the upward direction. The velocity of the ball when it is 39 m above the ground is closest to A) -38 m/s. B) -30 m/s. C) -23 m/s. D) -15 m/s. E) -45 m/s.
Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin?
a.
37 ?T
b.
28 ?T
c.
19 ?T
d.
47 ?T
e.
58 ?T