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Home  arrow Chapter 3  arrow Practice Questions

Practice Questions



This activity contains 25 questions.

Question 1.
If you drive west at 20 km/h for one hour, then drive east at 15 km/h for one hour, your net displacement will be


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Question 2.

A 200-lb force is pulling on an object, as shown. The sign of the x and y components of the force are


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Question 3.

Three boys each pull with a 20-N force on the same object. The resultant force will be


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Question 4.
Consider a plane flying with groundspeed Vg and airspeed Va in a wind with speed V. Which of the following relationships is true?


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Question 5.
Two vectors, R and S, are known:

If vector S is subtracted from vector R, the vector T = R - S is


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Question 6.
Two vectors, R and S, are known:

If vector R is subtracted from vector S, the vector T = S - R is


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Question 7.
Two vectors, R and S, are known:

If vector S is added to the vector R, then the vector T = R + S is


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Question 8.
If the acceleration vector of a body is perpendicular to the velocity vector, which of the following must be true?


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Question 9.
A vector of magnitude 10 has an angle with the positive x-axis (east) of 120 degrees. What are its components?


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Question 10.
A vector of magnitude 10 has an angle with the positive x-axis (east) of -60 degrees. What are its components?


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Question 11.
A vector has components x = 6 m and y = 8 m. What is its magnitude and direction?


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Question 12.
A vector has components x = -2 m and y = -2 m. What is its direction (angle with respect to east)?


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Question 13.
Three vectors have components (x,y): A = (2,3), B = (4,-7) and C = (-6,-3). What is the magnitude of the resultant vector (D = A + B + C)?


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Question 14.
Three vectors have components (x,y): A = (2,3), B = (4,-7) and C = (-6,-3). What is the magnitude of the resultant vector (D = A - B - C)?


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Question 15.
Suppose that several projectiles are fired on level ground. Which one will be in the air longest?


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Question 16.
Which of the following does not affect the range of a projectile?


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Question 17.
Which of the following must be zero for a projectile to achieve its maximum range?


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Question 18.
Which of the following must be zero for a projectile to be at its maximum height?


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Question 19.
You hit a handball too hard and it lands, moving horizontally, on top of a roof. If its original velocity was V0 at an angle θ above the horizontal, then the velocity it lands on the roof with is


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Question 20.

You throw a pebble upward as shown, with a velocity V0 at an angle θ, from a roof (at point J) h ft above the ground. If the pebble rises upward to h ft above the roof (to point K), then falls to the ground below (to point L), its speed when it hits the ground is

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Question 21.
Taking "up" as positive at the highest point, the acceleration of a projectile is


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Question 22.
If the sum of two vectors equals zero, the magnitude of their difference is


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Question 23.
A sailboat travelling with a speed of 4 knots heads directly up river against a 3 knot current. Its speed over ground is


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Question 24.
A sailboat travelling with a speed of 4 knots heads directly down river with a 3 knot current. Its speed over ground is


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Question 25.
A sailboat travelling with a speed of 4 knots heads directly across a river which has a 3 knot current. Its speed over ground is


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