How could the children in this photo best improve their balance with the help of two equal-mass weights?
a. Hold one weight in each hand with arms extended as shown in the photo.
b. Attach a weight to each ankle.
c. Place a weight in each of their left and right pockets in their trousers.
d. Hold one weight in each hand with arms held down instead of extended.
e. Hold one weight in each hand with one arm extended and one held down.
a
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Why is continental crust lower in density than seafloor crust?
A) Continental crust is made of rock, while seafloor crust has more metals. B) Continental crust is made from volcanic rock called basalt, which is lower in density than what the seafloor crust is made from. C) Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it. D) Continental crust is actually denser than seafloor crust. E) Seafloor crust is more compact due to the weight of the oceans, but it is made of the same material as the continental crust.
In an isochoric process, there is no change in
A) pressure. B) temperature. C) volume. D) internal energy. E) heat.
Magnetic Field of a Long Wire: A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/A)
A. 4.7 µT B. 6.4 µT C. 20 µT D. 56 µT
When a light wave enters into a medium of different refractive index,
A) its speed, frequency, and wavelength change. B) only its speed and frequency change. C) only its speed and wavelength change. D) only its frequency and wavelength change.