Aspecial vehicle of length 50 m is designed to take passengers at extremely high speeds between different places on earth.

(a) how fast must the vehicle move (in units of c) so that its length measured by an earthbound observer is 49 m?

(b) refer to part (a). if the vehicle carries passengers a distance of 6,000 km, by how much will the travel time measured by a clock on the vehicle differ from the time measured by an earth-based clock? in other words, what is δt vehicle − δt earth ?

What is the role of the ocular lens?

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 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) 0.69 m/s and (c) 2.2 m/s?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z