A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. A crane suddenly drops of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?

A) 5.70 m/s B) 4.20 m/s C) 6.30 m/s D) 3.80 m/s


C

Physics & Space Science

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Only about three comets per year plunge into the Sun and are destroyed

a. True b. False Indicate whether the statement is true or false

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The lifetime of a star is determined by its initial ______________

Fill in the blank(s) with correct word

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A. +x direction B. -x direction C. +y direction D. -y direction E. +z direction F. -z direction T. The field is zero.

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Classify the following statement as a characteristic

(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force is proportional to the magnitude of the field exerting it.

1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forces

Physics & Space Science