Quarter 1 physics cards

Which of the following quantities has units of velocity?

-120 m/s, 9.8 m/s downward

A blinking light of constant period is situated on a lab cart. Which diagram best represents a photograph of the light as the cart moves with constant velocity?

. . . . .

In a 4 kilometer race, a runner completes the first km in 5.9 min, the second km in 6.2 min, the third km in 6.3 min, and the final km in 6.0 min. The average speed of the runner for the race is approximately

.16 km/min

The sum of two vectors of fixed magnitudes has the greatest magnitude when the angle between these two vectors is

0 degrees.

Two vectors, of magnitudes 20 mm and 50 mm, are added together. Which one of the following is a possible value for the magnitude of the resultant?

40 mm

slope of a position vs time graph gives

velocity

A 5.0-meter vector and a 7.0-meter cector act concurrently on a point. As the angle between the vectors increased from 0 degrees to 180 degrees, the magnitude of rhe resultant of fhe two forces changes from

12m to 2m

The components of a 15-meters-per-second velocity is at an angle of 60 degrees above the horizontal are

13 m/s vertical and 7.5 m/s horizontal

A mass is moved 9.0 meters north and 12.0 meters east. The magnitude of displacement is

15.0 m

The sum of two vectors of fixed magnitudes has its minimum magnitude when the angle between these vectors is

180°

An object is placed 12 meters to the right and then 16 meters upward. The magnitude of rhe resultant displacement is

20 m

If you are driving 72 km/h along a straight road and you look to the side for 4 s, how far do you travel during rhis inattentive period?

20 m

A girl leaves a history classroom and walks 10. meters north to a drinking fountain. Then she turns and walks 30. meters south to an art classroom. What is the girl's total displacement from the history classroom to the art classroom?

20 m south

An object moves 15 m north and then 11 m south. Find the distance traveled and magnitude of displacement.

26 m and 4 m

A student walks 3 blocks south, 4 blocks west, and 3 blocks north. What is the displacement of the student?

4 blocks west

An airplane increases its speed at the average rate of 15 m/s2. How much time does it take to increase its speed from 100 m/s to 160 m/s?

4 s

When Jeff ran up a hill at 7.0 m/s, the horizontal component of his velocity vector was 5.1 m/s. What was the vertical component of Jeff's velocity?

4.8 m/s

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average speed?

5 m/s

A light-year is the distance light travels in one year. The speed of light is 3.00 x 10^8 m/s. How many miles are there in one light year? (1 mi = 1609 m, 1 y = 365 d)

5.88 x 10^12

A student walks 40 m along a hallway that heads due north, then turns and walks 30 m along another hallway that heads due east. What is the magnitude of the student's resultant displacement?

50 m

You walk 53 m to the north, then turn 60° to your right and walk another 45 m. Determine the direction of your displacement vector. Express your answer as an angle relative to east.

63 degrees N of E

A hiker travels 1.0 kilometer south, turns and travels 3.0 kilometers west, and then turns and travels 3.0 kilometers north. What is the total distance traveled by the hiker?

7.0 km

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

90° to 180°

Rhe magnitude of vector A is 5.5 m, and this vector lies in the second quadrant and makes an angle of 34 degrees with the +y-axis. The components of A are closest to

Ax=-3.1 m and Ay=4.6 m

A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is travelling faster when it hits the level ground below if neither of the experiences any air resistance?

Both are travelling at the same speed.

If the acceleration of an object is zero, then that object cannot be moving.

False

If three vectors add to zero, they must all have equal magnitudes.

False. Two small vectors can combine to form one large resultant equal to a third vector

If a vector's components are all negative, then the magnitude of the vector is negative.

False. Vector magnitudes cannot be nagative

If a vector pointing upward has a positive magnitude, a vector pointing downward has a negative magnitude.

False. Vectors cannot have negative magnitudes

Which combination of initial horizontal velocity and initial vertical velocity results in greatest horizontal range for a projectile over level ground?

High vertical and high horizontal velocities

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.

Its acceleration is in the -x direction.

Scalar is to vector as

Speed is to velocity

Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled.

The displacement is either less than or equal to the distance traveled.

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 must be correct for these two vectors?

The magnitude of vector A must be equal to the magnitude of vector B

Vector A is along the +x-axis and vector B is along the +y-axis. Which one of the following statements is correct with respect to these vectors?

The y component of vector A is equal to the x component of vector B

Consider a car that travels between points A and B. The car's average speed can be greater than the magnitude of its average velocity, but the magnitude of its average velocity can never be greater than its average speed.

True

If vector A-vector B=0 then the vectors A and B have equal magnitudes and are directed in the same direction

True

The magnitude of a vector can never be less than the magnitude of any of its components

True

The magnitude of a vector is only zero if all of its components are zero.

True

Vectors M and N obey the equation M+N=0. The vectors satisfy the statement:

Vectors M and N have the same magnitudes

An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of fhis object is

a horizontal straight line

Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum

could be as small as 2.0 m or as large as 12 m.

Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point?

exactly g

The magnitude of the resultant of two vectors cannot be less than the magnitude of either vector

false. Magnitudes can negate each other if they are in opposite directions

Compared to the magnitude of total displacement, distance is always

longer or the same

If Vector A+Vector B=Vector C and their magnitudes are given by A+B=C then vectors A and B are oriented

parallel to each other

A moving body must undergo a change of

position

For general projectile motion with no air resistance, the horizontal component of a projectile's velocity

remains a non-zero constant.

Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance in their speeds

remains constant

A softball player leaves the batter's box, overruns first base by 3.0 meters, and then returns to first base. Compared to the total distance traveled by the player, the magnitude of the player's total displacement from the batter's box is

smaller

Which is a scalar quantity?

speed