A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?

a. 8.1 N down the incline
b. 3.0 N down the incline
c. 2.1 N up the incline
d. 3.0 N up the incline
e. 8.1 N up the incline


c

Physics & Space Science

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Apart from its distance from its parent star, what is the next most important factor that determines a planet's habitability?

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A) electron clouds. B) the atomic nucleus. C) both of these D) neither of these

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If the headlights on a car are separated by 1.3 m, how far down the road can they be resolved if the angular resolution of the eye is 5.0 × 10-4 rad and the person has excellent vision?

A) 1.3 km B) 5.0 km C) 4.8 km D) 0.65 km E) 2.6 km

Physics & Space Science