The earth formed 4.57 X 10^9 years ago. What is this time in seconds?
A. 1.67 X10^12 S
B. 4.01 X 10^13 S
C. 2.40 X 10^ 9 S
D. 1.44 X 10^17 S
Answer: D. 1.44 X 10^17 S
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Kuiper Belt is a collection of iron meteorites
Indicate whether the statement is true or false
A 25-ft long crane supported at its lower end by a pin is elevated by a horizontal cable as shown in the figure. A 250-lb load is suspended from the outer end of the crane. The center of gravity of the crane is 10 ft from the pin, and the crane weighs 200 lb. What is the tension in the horizontal cable?
A. 610 lb B. 540 lb C. 640 lb D. 570 lb E. 2 000 lb
When a 100-? resistor is connected to a battery of emf E and internal resistance r, the battery delivers a power P = 0.794 W. When a 200 ? resistance is connected to same battery it delivers a power P = 0.401 W
What are the emf and internal resistance of the battery? A) E = 10 V, r = 5 ? B) E = 4.5 V, r = 4 ? C) E = 18 V, r = 4 ? D) E = 9 V, r = 2 ? E) E = 12 V, r = 6 ?
Rotational Kinetic Energy: A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?
A. the one of smallest diameter B. the one of greatest mass C. the disk D. the sphere E. They will reach the bottom at the same time.