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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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
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