plock of m = 12 kg is placed against the vertical front a cart as shown below. What acceleration must the rt have so that block A does not fall? The coefficient static friction between the block and the are is mg = A ) а. 24.5 m/s2 O b. none of these О с. 36.8 m/s? O d. 6.1 m/s2 D e. 18.4 m/s²

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Chapter1: Units, Trigonometry. And Vectors
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A block of m = 12 kg is placed against the vertical front
of a cart as shown below. What acceleration must the
cart have so that block A does not fall? The coefficient
of static friction between the block and the are is m, =
0.4.
a. 24.5 m/s2
O b. none of these
О с. 36.8 m/s?
O d. 6.1 m/s?
О е. 18.4 m/s?
Transcribed Image Text:A block of m = 12 kg is placed against the vertical front of a cart as shown below. What acceleration must the cart have so that block A does not fall? The coefficient of static friction between the block and the are is m, = 0.4. a. 24.5 m/s2 O b. none of these О с. 36.8 m/s? O d. 6.1 m/s? О е. 18.4 m/s?
A thin, uniform 12-kg bar that is 2 m long rotates
uniformly about a pivot at one end,
making 5 complete revolutions every 3 seconds. What
is the kinetic energy of this
bar? (Hint: Different points in the bar have different
speeds. Break the bar up into
infinitesimal segments of mass dm and integrate to add
up the kinetic energies of all these segments.)
a. 877 J
O b. 439 J
c. 1097 J
O d. none of these
O e. 658 J
Transcribed Image Text:A thin, uniform 12-kg bar that is 2 m long rotates uniformly about a pivot at one end, making 5 complete revolutions every 3 seconds. What is the kinetic energy of this bar? (Hint: Different points in the bar have different speeds. Break the bar up into infinitesimal segments of mass dm and integrate to add up the kinetic energies of all these segments.) a. 877 J O b. 439 J c. 1097 J O d. none of these O e. 658 J
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