Physics

What is the angle between the vectors A and -A when these vectors are drawn from a common origin?A) 90°B) 0°C) 360°D) 180°E) 270° A car travels along east and its velocity decreases. The acceleration of the car is in which of the following directions?A) EastwardB) WestwardC) NorthwardD) SouthwardE) Cannot be determined without additional information …

What is the angle between the vectors A and -A when these vectors are drawn from a common origin? A) 90° B) 0° C) 360° D) 180° E) 270°.A car travels along east and its velocity decreases. The acceleration of the car is in which of the following directions? A) Eastward B) Westward C) Northward D) Southward E) Cannot be determined without additional information.Under which of the following conditions would a car have a westward acceleration? A) As a car travels eastward with its velocity is increasing. B) As a car travels eastward with its velocity is decreasing. C) As a car travels westward with its velocity is decreasing. D) As a car travels westward with its velocity is constant. E) As a car travels eastward with its velocity is constant.A car travels along eastward with a constant velocity. The magnitude of the acceleration of the car is A) decreasing. B) increasing. C) non-zero constant. D) zero. E) None of the other choices is correct.If the acceleration vector of an object is directed parallel to the velocity vector, then A) the object is speeding up. B) the object is slowing down. C) the object is moving with a constant velocity. D) the object is turning. E) the object is at rest. Read More »

What is the smallest number of vectors that can be added to give a zero resultant?A) 2B) 3C) 4D) 5E) You cannot add vectors and obtain a zero resultant. Two vectors A and B are added together giving vector C. The magnitude of C is such that C = sqrt(A2+B2). If the magnitudes of both …

What is the smallest number of vectors that can be added to give a zero resultant? A) 2 B) 3 C) 4 D) 5 E) You cannot add vectors and obtain a zero resultant.Two vectors A and B are added together giving vector C. The magnitude of C is such that C = sqrt(A2+B2). If the magnitudes of both vectors A and B are doubled, the magnitude of vector C will A) increase by a factor of 8. B) increase by a factor of 4. C) increase by a factor of 2. D) increase by a factor of sqrt(2). E) not change.If three vectors add up to a zero resultant it is correct to say that A) it is impossible to find three vectors that add up to a zero resultant. B) the three vectors must be co-linear. C) the three vectors must be in a plane. D) the three vectors must have the same magnitude. E) the three vectors cannot have the same magnitude.Three vectors have equal magnitudes and make 120° with each other. We can say that A) the magnitude of the resultant is one-third the magnitude of the component vectors. B) the magnitude of the resultant is three times the magnitude of the component vectors. C) the magnitude of the resultant is more than three times the magnitude of each component vector. D) the resultant is zero. E) the magnitude of the resultant is equal to the magnitude of the component vectors. Read More »

The sum of two vectors has the greatest magnitude when the angle between these two vectors isA) 90°.B) 180°.C) 60°.D) 0°.E) 270°. The resultant vector C of two vectors A and B will have the minimum value when the angle between these vectors is one of the following?A) 0°.B) 90°.C) 270°D) 180°E) 360° When vectors …

The sum of two vectors has the greatest magnitude when the angle between these two vectors is A) 90°. B) 180°. C) 60°. D) 0°. E) 270°.The resultant vector C of two vectors A and B will have the minimum value when the angle between these vectors is one of the following? A) 0°. B) 90°. C) 270° D) 180° E) 360°.When vectors A and B are added together they form vector C and these vectors satisfy the relationship A2 + B2 = C2. Which statement is true for these vectors? A) Vectors A and B must be parallel. B) Vectors A and B must be anti-parallel. C) Vectors A and B must have the same magnitudes. D) Vectors A and B must be perpendicular. E) The magnitude of A is the negative of the magnitude of B.Vectors M and N satisfy the equation M + N = 0. These vectors satisfy one of the following statements. A) Vectors M and N are at right angles to each other. B) Vectors M and N point in the same direction. C) The magnitude of M is the negative of the magnitude of N. D) The magnitude of M is twice the magnitude of N. E) Vectors M and N have the same lengths.A vector A and an anti parallel vector B when added together give a resultant vector C that has a magnitude of 1.0 m. If vector A has a magnitude of 7.0 m, which of the following is a possible magnitude of vector B? A) 8.0 m B) 7.0 m C) 2.4 m D) 6.9 m E) 9.0 m Read More »

Vector A is initially pointing eastward. This vector is rotated clockwise by an angle of 110°. Which of the following statements is correct regarding the final position of vector A?A) It is pointing 20° west of south.B) It is pointing 70° south of east.C) It is pointing 20° south of west.D) It is pointing 70° …

Vector A is initially pointing eastward. This vector is rotated clockwise by an angle of 110°. Which of the following statements is correct regarding the final position of vector A? A) It is pointing 20° west of south. B) It is pointing 70° south of east. C) It is pointing 20° south of west. D) It is pointing 70° east of south. E) cannot be determined without additional information.Vector A has a magnitude of 16.0 m and is pointing eastward. Vector B also has a magnitude of 16.0 m and is pointing westward. Vector is rotated clockwise by 110° and vector is rotated counterclockwise by 110°. Which one of the following statements is correct? A) The northward component of vector A is bigger than the northward component of vector B. B) The southward component of vector A is bigger than the southward component of vector B. C) The eastward component of vector A is bigger than the westward component of vector B. D) The westward component of vector A is bigger than the eastward component of vector B. E) The westward component of vector A is equal to the eastward component of vector B.The eastward component of vector A is equal to the westward component of vector B and their northward components are equal. Which one of the following statements is correct for these two vectors? A) Vector A is parallel to vector B. B) Vector A is anti-parallel to vector B. C) Vector A is perpendicular to vector B. D) Magnitude of vector A is equal to the magnitude of vector B. E) Magnitude of vector A is twice the magnitude of vector B. Read More »

Which of the following statements is a true statement?A) A vector can have positive or negative magnitudes.B) A vector’s magnitude cannot be more than the magnitude of one of its components.C) A vector’s magnitude cannot be less than the sum of the magnitude of its components.D) If the x-component of a vector is smaller than …

Which of the following statements is a true statement? A) A vector can have positive or negative magnitudes. B) A vector’s magnitude cannot be more than the magnitude of one of its components. C) A vector’s magnitude cannot be less than the sum of the magnitude of its components. D) If the x-component of a vector is smaller than its y-component then that vector is in the opposite direction to its y-component. E) The magnitude of a vector cannot be zero unless all of its components are zero.If a vector A has components Ax > 0, and Ay > 0, then the angle that this vector makes with the positive x-axis must be in the range A) 0° to 90°. B) 90° to 180°. C) 180° to 270°. D) 270° to 360°. E) cannot be determined without additional information.If a vector A has components Ax < 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range A) 0° to 90°. B) 90° to 180°. C) 180° to 270°. D) 270° to 360°. E) cannot be determined without additional information.Vector B is obtained by rotating vector A counterclockwise by 270°. The components of B will A) have the same signs as those of A. B) have opposite signs as those of A. C) The x-components will have opposite signs but the y-components will not. D) The y-components will have opposite signs but the x-components will not. E) depend on the quadrant where A is. Read More »

Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John jumpsA) 0.50 times as long.B) 1.41 times as long.C) twice as long.D) three times as long.E) four times as long. Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both …

Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John jumps A) 0.50 times as long. B) 1.41 times as long. C) twice as long. D) three times as long. E) four times as long.Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.From the edge of a roof top you toss a green ball upwards with initial velocity v0 and a blue ball downwards with the same initial velocity. When they reach the ground below, A) the green ball will be moving faster than the blue ball. B) the blue ball will be moving faster than the green ball. C) the two balls will have the same speed.You drop a stone from a bridge to the river below. After this stone has traveled a distance d, you drop a second stone. The distance between the two stones will always A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.Which of the following is a scalar quantity? A) velocity B) acceleration C) displacement D) mass E) force.Which of the following is a vector quantity? A) time B) mass C) volume D) displacement E) speed Read More »

A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubled, the time required to stop wouldA) double as well.B) decrease by a factor of two.C) stay the same.D) quadruple.E) decrease by a factor of four. …

A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubled, the time required to stop would A) double as well. B) decrease by a factor of two. C) stay the same. D) quadruple. E) decrease by a factor of four.A stone is thrown straight up. When it reaches its highest point, A) both its velocity and its acceleration are zero. B) its velocity is zero and its acceleration is not zero. C) its velocity is not zero and its acceleration is zero. D) neither its velocity nor its acceleration is zero. E) neither velocity nor acceleration can be determined without additional information.Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up. A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration points downward. E) Neither velocity nor acceleration can be determined without additional information.Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John stays in the air A) 0.50 times as long. B) 1.41 times as long. C) twice as long. D) three times as long. E) four times as long. Read More »

If the velocity versus time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object isA) moving with constant non-zero speed.B) moving with constant non-zero acceleration.C) at rest.D) moving with infinite speed.E) none of the above. The area under a curve in a velocity versus …

If the velocity versus time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object is A) moving with constant non-zero speed. B) moving with constant non-zero acceleration. C) at rest. D) moving with infinite speed. E) none of the above.The area under a curve in a velocity versus time graph gives A) distance traveled. B) displacement. C) speed. D) velocity. E) acceleration.A car moving initially with velocity v0 with deceleration a comes to a full stop after traveling a distance d. We can say that the velocity of the car after traveling a distance d/2 is A) greater than v0/2. B) equal than v0/2. C) smaller than v0/2. D) has no relationship to v0.A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would A) double as well. B) decrease by a factor of two. C) stay the same. D) quadruple. E) decrease by a factor of four. Read More »

An object is moving with constant non-zero acceleration in the +x-axis. The position versus time graph of this object isA) a horizontal straight line.B) a vertical straight line.C) a straight line making an angle with the time axis.D) a parabolic curve.E) a hyperbolic curve. An object is moving with constant non-zero velocity in the +x-axis. …

An object is moving with constant non-zero acceleration in the +x-axis. The position versus time graph of this object is A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.An object is moving with constant non-zero velocity in the +x-axis. The velocity versus time graph of this object is A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.An object is moving with constant non-zero acceleration in the +x-axis. The velocity versus time graph of this object is A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.If the position versus time graph of an object is a horizontal line, the object is A) moving with constant non-zero speed. B) moving with constant non-zero acceleration. C) at rest. D) moving with infinite speed. E) none of the above.If the velocity versus time graph of an object is a horizontal line, the object is A) moving with constant non-zero speed. B) moving with constant non-zero acceleration. C) at rest. D) moving with infinite speed. E) none of the above Read More »

The motion of a particle is described in the velocity vs. time graph shown in Figure 2-1. We can say that its speedA) increases.B) decreases.C) increases and then decreases.D) decreases and then increases.E) remains constant. Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. …

The motion of a particle is described in the velocity vs. time graph shown in Figure 2-1. We can say that its speed A) increases. B) decreases. C) increases and then decreases. D) decreases and then increases. E) remains constant.Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) A statement cannot be made using the information given.An object is moving with constant non-zero velocity in the +x-axis. Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) A statement cannot be made using the information givenThe position versus time graph of this object is A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve. Read More »