2) If the aceteration vector ot an objct is directed anti-parallet to the vel-ll

Question

2) If the aceteration vector ot an objct is directed anti-parallet to the vel-lly A) the object is speeding up. B) the obirct is turning C) the object is slowing down. D) the objeet is moving in the negative x-direction E) the object is at rest. 3) Michael points a rifle horizontally 3.30 m above the ground. The buet leaves the tarrel at 325.m/ s. al the same time, a stone is dropped from rest 3.30 m above the ground, which reaw hes the ground first? (assume level terrain) A) neither 8) the stone C) the ball SHORT ANSWER. Write the word or phrase tha t best completes each statement or answers the question. 4) Which is less ex pensive (least cost per volume)? (a) A gallon of gasoline at $1.00 per gallon (h) A liter of gasoline at 27 cents per liter MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. You are serving the volleyball for the second time in a the velocity it had on your first serve, its horizontal volleyhail game. If the hall leaves your hand with twice irst serve A) half as much B) 2/2 times as much. C) /2 times as much. D) four times as much. E) twice as much 6) When a baill is thrown straight up, which of the following is zero at its highest point? B) velocity C) acceleration A) displacement 7) A skydiver jumps from a high-flying plane. When she reawhes terminal velocity, her veloxity A) is increasing at a constant rate. C) is essentially constant. B) is decrensing D) is essentially zero. TRUE/FALSE. Write T' if the statement is true and 'F if the statement is false. 8) Dimensional analysis can tell you whether an equation is physically correct

Explanation / Answer

2) If the acceleration vector of an object is directed anti-parallel to the velocity vector it means that object is slowing down. Therefore, option (c) is correct.

3) after firing, bullet will be under free fall and will take time given as

t = sqrt (2h/g)

for stone under free fall, t = sqrt (2h /g)

Therefore, neither of them reaches first.

4) 1 gallon has 3.78541 liters. as 1 liter of gasoline is 27 cents , it will take 103 dollars for one gallon at this price, Therefore , 1 gallon is less expensive (option a)

5) H is proportionla to v2. Therefore, range will increase by 4 times

6) velocity is zero at highest point.

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