How many significant figures are in 0.0037010?
A) four
B) five
C) six
D) seven
E) eight
B
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An ice skater has a moment of inertia of 5.0 kg?m2 when her arms are outstretched. At this time she is spinning at 3.0 revolutions per second (rps)
If she pulls in her arms and decreases her moment of inertia to 2.0 kg?m2, how fast will she be spinning? A) 2.0 rps B) 3.3 rps C) 7.5 rps D) 8.4 rps E) 10 rps
A hockey puck traveling at speed v on essentially frictionless ice collides with one end of a straight stick lying flat on the ice and sticks to that end. In this collision
a. momentum is conserved. b. angular momentum is conserved. c. energy is conserved. d. all of the above are conserved. e. only momentum and angular momentum are conserved.
What observations indicate the presence of dust in the interstellar medium?
What will be an ideal response?
To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?