A 40.0-kg child running at a speed 3.00 m/s jumps on a stationary playground merry-go-round at a distance 1.50 m from the axis of rotation of the merry-go-round
The child is traveling tangential to the edge of the merry-go-round which has a 600 kg?m2 moment of inertia about its axis of rotation as she is running. What is the angular speed of the merry-go-round after the child jumps on it?
A)
0.788 rad/s
B)
0.261 rad/s
C)
6.28 rev/s
D)
2.00 rad/s
E)
3.14 rev/s
B
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A transverse periodic wave is represented by the equation y(z, t) = 2.0 cm sin(1,200 rad/s t - 20.0
z). Another transverse wave is represented by the equation y(z, t) = 2.0cm sin(1,200 rad/s t + 20.0
z). What is the equation that represents the superposition of the two waves?
A. y(z, t) = 4.0 cm sin(1,200 rad/s t - 20.0 
z)
B. y(x, t) = 4.0 cm sin(1,200 rad/s t) cos(20.0x)
C. y(x, t) = +4.0 cm cos(1,200 rad/s) sin(20.0
x)
D. y(x, t) = +4.0 cm cos(1,200 rad/s) + (20.0x)
In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. A gold ion, Au+, has a mass of approximately 3.3 × 10-22 g. How many grams of gold are deposited by this process?
A) 33 g B) 16 g C) 22 g D) 28 g E) 97 g
When uranium-238 (Z = 92) is bombarded with a neutron, it can change into uranium-237
a. True b. False Indicate whether the statement is true or false
Is heat absorbed or released by ice when it melts?