Two balls, A and B, are released simultaneously from rest at the left end of the equal-length tracks, as shown. (a) Which ball will reach the end of its track first? (b) Does ball B roll faster along the lower part of track B than ball A rolls along track A? (c) Is the speed gained by ball B going down the extra dip the same as the speed it loses going up near the right-hand end? Does this mean that the speeds of balls A and B will be the same at the ends of the tracks? (d) So, overall, does ball A or ball B have the greater average speed? (Do you wish to change your answer to (a)?
Two balls, A and B, are released simultaneously from rest at the left end of the equal-length tracks, as shown. (a) Which ball will reach the end of its track first? (b) Does ball B roll faster along the lower part of track B than ball A rolls along track A? (c) Is the speed gained by ball B going down the extra dip the same as the speed it loses going up near the right-hand end? Does this mean that the speeds of balls A and B will be the same at the ends of the tracks? (d) So, overall, does ball A or ball B have the greater average speed? (Do you wish to change your answer to (a)?
Two balls, A and B, are released simultaneously from rest at the left end of the equal-length tracks, as shown.
(a) Which ball will reach the end of its track first?
(b) Does ball B roll faster along the lower part of track B than ball A rolls along track A?
(c) Is the speed gained by ball B going down the extra dip the same as the speed it loses going up near the right-hand end? Does this mean that the speeds of balls A and B will be the same at the ends of the tracks?
(d) So, overall, does ball A or ball B have the greater average speed? (Do you wish to change your answer to (a)?
Blue light has a wavelength of 485 nm. What is the frequency of a photon of blue light?
Question 13
Question 13
What is the wavelength of radiofrequency broadcast of 104 MHz?
Question 14
Question 14
1 Point
3. The output intensity from an x-ray exposure is 4 mGy at 90 cm. What will the intensity of the exposure be at 180 cm?
Question 15
Question 15
1 Point
What is the frequency of an 80 keV x-ray?
Under what condition is IA - BI = A + B?
Vectors
À
and
B
are in the same direction.
Vectors
À
and B
are in opposite directions.
The magnitude of vector
Vectors
À
and
官
B
is zero.
are in perpendicular directions.
For the vectors shown in the figure, express vector
3 in terms of vectors M and N.
M
S
=-M+ Ň
==
S=м- Ñ
S = M +Ñ
+N
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