A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?

A. 5.0 N
B. 3.8 N
C. 4.2 N
D. 4.6 N
E. 6.5 N


Answer: B

Physics & Space Science

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A hydraulic device has two pistons, one with a small cross-section area and another piston with a larger cross-section area. If a given force is applied to the small piston, the output force on the larger-area piston will be

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The vibrational frequency of an HF molecule is 8.72 × 1013 Hz and the reduced mass of the molecule is 1.589 × 10-27 kg

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In a circuit, three pieces of wire labeled A, B and C are joined at a common point, D. If wire B carries 1.5 mA in a direction away from D and C carries current 1.3 mA toward D, what does wire A carry?

A. 0.2 mA toward D B. 0.2 mA away from D C. 2.8 mA toward D D. unable to determine E. 2.8 mA away from D

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