What is the magnitude of the gravitational force that two small 7.00-kg balls exert on each other when they are 35.0 cm apart? (G = 6.67 × 10-11 N ? m2/kg2 )
What will be an ideal response?
2.67 × 10-8 N
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The evolution of a "high mass star" is different from the evolution of smaller stars because these stars ____
a. do not generate strong stellar winds b. rotate faster c. have stronger magnetic fields d. can ignite carbon fusion e. are never in binary systems
The East African rift zone was formed by
A) two pieces of continental crust separating B) two pieces of oceanic crust colliding C) two pieces of continental crust colliding D) pieces of oceanic and continental crust colliding
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. S1 and S2 are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the waves shown arriving at P1 both arrive with amplitude A, the resultant amplitude at point P1 is
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A.
B.
.C.
D.
.E.
Projectile Motion: An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance?
A. 0.50 s B. 0.88 s C. 1.1 s D. 2.5 s E. 0.54 s