State the relationship between the frequency and the period of a wave
frequency = 1/period.
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Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m B. 1.5 m C. 0.10 m D. 9.8 m E. 2.4 m
A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?
a.
?34 J
b.
?64 J
c.
?30 J
d.
?94 J
e.
+64 J
A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s. What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s.)
a. 34.7 m/s c. 23.1 m/s b. 44.4 m/s d. 17.4 m/s
Approximately how long ago was Pluto discovered?
A) about 2000 years ago B) about 25 years ago C) about 75 years ago D) in ancient history E) about 200 years ago