Why don't short-period comets have randomly oriented orbits?
a. Their orbits have been altered by encounters with planets
b. Their orbits are altered by the Sun's gravitational pull.
c. Their orbits have been altered by impacts from asteroids.
d. Their orbits have been altered by the Lagrange points of Jupiter.
e. Their orbits have been altered by solar wind particles from a CME.
a
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Describe the motion of an object that possesses kinetic energy yet undergoes no net displacement.
a) The object must be rolling b) The object must be sliding c) The object must be at rest d) The object must be spinning e) The object must be falling
You push downward on a trunk at an angle 25° below the horizontal with a force of If the trunk is on a flat surface and the coefficient of static friction between the surface and the trunk is 0.61,
what is the most massive trunk you will be able to move? A) 81 kg B) 93 kg C) 73 kg D) 112 kg
An airplane flies in a semi-circular arc in order to simulate “weightlessness” for its occupants. If the radius of the semicircular path it flies is 3500 m, what is the speed at which the plane flies?
A. 357 m/s B. 580 m/s C. 185 m/s D. 1180 m/s
Consider a human heart rate of 80 beats per minute. If someone's heart beats at that rate over a 70-yr lifetime, how many times would it beat?
A) 2.20 × 109 B) 7.44 × 105 C) 3.26 × 1010 D) 2.95 × 109 E) 1.78 × 107