A uniform, horizontal beam of length 6.0 m and weight 94 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?

Select one:

a.298.5 N

b.13.6 N

c.54.3 N

d.488.4 N

e.108.5 N

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5.1 Uniform Circular Motion

The distance from the center of a Ferris wheel to a passenger seat is 6.0 m. What centripetal acceleration does a passenger experience when the wheel rotates once every 4seconds?

Select one:

a.1.5 m/s2

b.9.0 m/s2

c.3.0 m/s2

d.16.9 m/s2

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3.3 Adding Friction to the Mix

A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200. A string attached to the block is pulled horizontally, resulting in a 3.00 m/s2acceleration by the block. Find the tension in the string. (g= 9.80 m/s2)

Select one:

a.9.80 N

b.24.8 N

c.19.8 N

d.0.200 N

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A 14.0-g bullet is fired into a 1,100-g block of wood which is suspended as a ballistic pendulum. The combined mass swings up to a height of 8.50cm. What was the kinetic energy of the combined mass immediately after the collision?

Select one:

a.0.928 103J

b.0.928J

c.0.916J

d.0.095J

e.0.012J

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1.3 Dealing with Numbers

Multiplying a 4 significant figure number by a 3 significant figure number and then dividing the product by a six significant figure number yields a number with how many significant figures?

Select one:

a.2

b.3

c.7/6

d.13

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Which of the following increases the internal energy of a solid metal rod?

Select one:

a.having the rod conduct heat

b.having the rod absorb heat

c.raising it to a greater height

d.throwing it through the air

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A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 190meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 55. How high is the fountain?

Select one:

a.53m

b.43m

c.25m

d.48m

e.86m

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Starting from rest, a wheel undergoes constant angular acceleration for a period of timeT. At which of the following times does the average angular acceleration equal the instantaneous angular acceleration?

Select one:

a.0.50 T

b.all of the above

c.0.67 T

d.0.71 T

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A baseball pitcher, loosening up his arm before a game, tosses a 0.15-kg ball using only the rotation of his forearm, 0.30 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 22 m/s in a time of 0.4 s, what is the average angular acceleration of the arm and ball?

Select one:

a.2.6 rad/s2

b.29.3 rad/s2

c.183.3 rad/s2

d.16.5 rad/s2

e.27.5 rad/s2

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How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order of magnitude.

Select one:

a.about a thousand years

b.since Aristotle

c.about a century

d.about a decade