When a spinning ice skater pulls in his arms, he spins faster because ________
A) there exists an unbalanced reaction force
B) there is less friction with the ice
C) there is less friction with the air
D) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation
D
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3.42 × 10^7 km is the same as 3.42 × 10^4 m
a. True b. False Indicate whether the statement is true or false
When pore spaces become completely filled with water, the soil is considered to be at
What will be an ideal response?
After what evolutionary stage does a star become a white dwarf?
a. Protostar b. Pre-main sequence c. Main sequence d. Giant
A piece of dirt falls from the bed of a moving truck. It strikes the ground directly below the end of the truck. (a) What is the direction of its velocity relative to the truck just before it hits? (b) Is this the same as the direction of its velocity relative to ground just before it hits? Explain your answers.
a. The velocity of the dirt is backward relative to the truck just before it hits the ground, (b) The velocity of the dirt is backward relative to the ground just before it hits the ground, b. The velocity of the dirt is backward relative to the truck just before it hits the ground, (b) The velocity of the dirt is forward relative to the ground just before it hits the ground, c. The velocity of the dirt is forward relative to the truck just before it hits the ground, (b) The velocity of the dirt is leftward relative to the ground just before it hits the ground,