# Project #48244 - Physics

MUST SHOW ALL WORK WITH EQUATIONS, STEP BY STEP TO SHOW HOW YOU ARRIVED AT FINAL ANSWER.

1.

For the motion described in the graph that accompanies this problem decide whether the moving object is accelerating, decelerating, or moving at a constant velocity.

 A. Decelerating

 B. Moving at a constant velocity

 C. Accelerating

 D. There is insufficient information for an answer.

2.

Two objects are fired into the air. The drawing shows that they reach the same height, but the ranges of their projectile motions are different. Which one is in the air for the greatest amount of time?

 A. Both projectiles are in the air for the same amount of time.

 B. Projectile 2, because it has the greater range.

 C. Projectile 1, because it has the smaller initial speed and, therefore, travels more slowly than projectile 2.

 D. Projectile 1, because it has the smaller range and, hence, the horizontal component of its velocity is smaller than that of projectile 2.

3.  A sailboat leaves a harbor and sails 1.8 km in the direction 65° south of east, where the captain stops for lunch. A short time later, the boat sails 1.1 km in the direction 15° north of east. What is the magnitude of the resultant displacement from the harbor?

 1.5 km

 1.2 km

 2.3 km

 2.9 km

 0.59 km

4.

A car is initially traveling at 50.0 km/h. The brakes are applied and the car stops over a distance of 35 m. What was magnitude of the car's acceleration while it was braking?

 9.8 m/s2

 2.8 m/s2

 36 m/s2

 71 m/s2

 5.4 m/s2

5.

A diver springs upward from a board that is 4.10 m above the water. At the instant she contacts the water her speed is 12.5 m/s and her body makes an angle of 76.7 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and (b)direction.

6. A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 135 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 73.2 kg, and the coefficient of kinetic friction between the snow and the runners of the sled is 0.268. How much time is required for the sled to travel down a 143-m slope, starting from rest?

 Subject Science Due By (Pacific Time) 11/19/2014 10pm
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