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Intermediate
Mathematical
FRQ

A sample of an unknown material appears to weigh \( 285 \) \( \text{N} \) in air and \( 195 \) \( \text{N} \) when immersed in alcohol of specific gravity \( 0.700 \).

Beginner
Conceptual
MCQ

You drop a rock off a bridge. When the rock has fallen \( 4 \) \( \text{m} \), you drop a second rock. As the two rocks continue to fall, what happens to their velocities?

Beginner
Mathematical
FRQ

A rock is thrown vertically upward with a velocity of \( 20 \, \text{m/s} \) from the edge of a bridge \( 42 \, \text{m} \) above a river.

Beginner
Mathematical
MCQ

A \(1200 \, \text{kg}\) car moving at \(15.6 \, \text{m/s}\) suddenly collides with a stationary car of mass \(1500 \, \text{kg}\). If the two vehicles lock together, what is their combined velocity immediately after the collision?

Beginner
Conceptual
GQ

A projectile has the least speed at what point in its path?

Intermediate
Conceptual
MCQ

Which statements are not valid for a projectile? Take up as positive.

Intermediate
Mathematical
MCQ

Balsa wood with an average density of \( 130 \) \( \text{kg/m}^3 \), is floating in pure water. What percentage of the wood is submerged?

Beginner
Mathematical
MCQ

A vertical rope of negligible mass supports a block that weighs \(30 N\). The breaking strength of the rope is \( 50 N\). The largest acceleration that can be given to the block by pulling up on it with the rope without breaking the rope is most nearly

Beginner
Conceptual
GQ

Describe two examples in which the force of friction exerted on an object is in the direction of motion of the object.

Beginner
Mathematical
GQ

A centrifuge accelerates uniformly from rest to 15,000 rpm in 240 s. Through how many revolutions did it turn in this time?

Intermediate
Mathematical
MCQ

 

The graph above represents the motion of an object traveling in a straight line as a function of time. What is the average speed of the object during the first four seconds?

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