Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct?
A) It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier.
B) It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier.
C) It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter.
D) It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter.
E) The two objects reach the bottom of the ramp at exactly the same time.
E
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A grinding wheel is spinning at a rate of 20.0 revolutions per second. When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest
(a) What was the angular acceleration of the grinding wheel as it came to rest? (b) How many rotations did the wheel make during the time it was coming to rest?
One unusual aspect of dark energy is
A) its pushes outward on everything in the universe instead of pulling inward as gravity ordinarily does. B) it's made of a material that has not yet been observed in our laboratories. C) Both of the above. D) it exerts no gravitational force. E) it exerts a new kind of fundamental force, never observed before.
The resistance of a conducting material depends on its
a. composition b. length c. diameter d. temperature e. all of the above
X-Ray Diffraction: A crystal is irradiated with x-rays with a wavelength of 0.120 nm. The atomic planes in the crystal are separated by 0.21 nm. At what angles of incidence with respect to the normal will the x-rays reflect from the crystal?
A. 73°, 55°, 31° B. only 55° C. only 73° and 31° D. only 73°