A roller coaster, loaded with passengers, has a mass of 3000 kg; the radius of curvature of the track at the bottom point of the dip is 24 m. If the vehicle has a speed of 18 m/s at this point, what force is exerted on the vehicle by the track? (g = 9.8 m/s2)
a. 2.3 × 10^4 N
c. 7.0 × 10^4 N
b. 4.7 × 10^4 N
d. 1.0 × 10^4 N
C
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A spear is thrown at you at a very high speed. As it passes, you measure its length as one-half its normal length. From this measurement, you conclude that the moving spear's mass must be
A) one-half its rest mass. B) twice its rest mass. C) four times its rest mass. D) zero.
Which of the following sound frequencies lie(s) outside the audible range?
a. 14 Hz b. 11 kHz c. 2700 Hz d. All of these
Building new telescopes: With current telescopes, we can see galaxies as they existed 1 billion years after the Big Bang. Discuss innovations that could be made with new telescopes in order to see even further
What will be an ideal response?
The process in which thermal energy flows by the mass movement of molecules from one place to another is known as
A) conduction. B) convection. C) radiation.