Which force is the most difficult to incorporate into a single unified theory of the fundamental forces?
A) centrifugal forces
B) the armed forces
C) the gravitational force
D) the weak force
E) the electromagnetic force
C
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A skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 12° with the horizontal. The rope moves parallel to the slope with a constant speed of 1.0 m/s. The force of the rope does 900 J of work on the skier as the skier moves a distance of 8.0 m up the incline.
(a) If the rope moved with a constant speed of 2.0 m/s, how much work would the force of the rope do on the skier as the skier moved a distance of 8.0 m up the incline? At what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 1.0 m/s and (c) 2.0 m/s?
Most of the liquid hydrocarbons on Titan are concentrated in
A) lakes B) surface oceans C) subsurface oceans D) ponds
An object with a mass of 10 kg is moving along a horizontal surface. At a certain point it has a speed of 28 m/s
If the coefficient of friction between the object and the surface is 0.40, how far will the object go before it comes to a stop? Use g = 10 m/s2. A) 98 cm B) 61 m C) 98 m D) 23 m E) 61 cm
What are the two possible explanations for not seeing something glowing brightly along every line-of-sight?
I) The universe is infinite in size and infinitely old, but dust absorbs starlight from far away stars. II) The universe has a finite number of stars. III) The universe is changing in some way as to prevent us from seeing an infinite number of stars. A) I and III B) II and III C) I and II