22. I point) You and your friend each throw a rock in the air. You throw you roc

Question

22. I point) You and your friend each throw a rock in the air. You throw you rock at an angle of 45 degrees above horizontal. Your friend throws his ro straight up. Ignoring air resistance, while the rocks are in flight, how gravitational accelerations experienced by the rocks compare? a) They are the same. do the b) Your rock experiences a larger gravitational acceleration. c) Your friend's rock experiences a larger gravi d) They are the same only at the highest parts of their trajectories. tational acceleration 23. (1 point) Consider a waterfall with the river water flowing horizontally off of a cliff at 2.1 m/s before falling 120 m to a lake below. After leaving the cliff, it takes the water 4.9 seconds to fall to the lake. Later on, following a heavy rainstorm, river flows f the aster causing the water to flow horizontally off of the cliff at 4.2 m/s. How long does it take the water to fall to the lake in this case? a) 2.5 s b) 4.2s c) 4.9 s d) 9.8 s 24. (1 point) A velocity vector has an x-component of v, 1.0 m/s and a y- component of v 1.5 m/s. What is the magnitude and direction (in degrees) of v? a) 1.8 m/s at 56 degrees above the x-axis b) 1.8 m/s at 34 degrees above the x-axis c) 1.8 m/s at 45 degrees above the x-axis d) 1.0 m/s at 62 degrees above the x-axis e) 1.5 m/s at 56 degrees above the x-axis 25. (1 points) A skier goes down a slope with an acceleration of 4.2 m/s. If we ignore friction and air resistance, what is the angle of the slope with respect to the horizontal direction? a) 15 degrees b) 25 degrees c) 45 degrees d) 65 degrees

Explanation / Answer

22)

acceleration acting is always equal to acceleration due to gravity for both the rocks

Answer: a

23)

There is no change in motion in vertical direction.

In vertical direction for both the cases,

vi = 0 m/s

height is same

a = -9.8 m/s^2

So, time taken to reach ground should be same for both

Answer: c

I am allowed to answer only 1 question at a time

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