Physics Exam 1
For general projectile motion with no air resistance, the horizontal component of a projectile's velocity a. remains zero. b. continuously increases. c. continuously decreases. d. remains a non-zero constant.
d.
For general projectile motion with no air resistance, the vertical component of a projectile's acceleration a. is always zero. b. continuously decreases. c. continuously increases. d. remains a non-zero constant.
d.
Graph of an object at rest: a. vertical line b. horizontal line with t as y axis c. vertical line with t as x axis d. Horizontal Line with x as y axis and t as x axis
d.
Which of the following situations is impossible? A An object has velocity directed east and acceleration directed west. B An object has velocity directed east and acceleration directed east. C An object has zero velocity but non-zero acceleration. D An object has constant non-zero velocity and changing acceleration. E An object has constant non-zero acceleration and changing velocity.
D
According to kinematics (x=.5g*t2), the acceleration is dependant only upon a. the mass of the object b. the distance that the object fell c. the shape of the object d. where the object is located.
d.
. Consider a deer that runs from point A to point B. The distance the deer runs can be greater than the magnitude of its displacement, but the magnitude of the displacement can never be greater than the distance it runs. A True B False
A
A football player kicks a ball. if there are three different possible landing points which option will hit first if all the max heights are the same? Ignore air resistance a. All the same b. First c. Third d. Second e. Not enough information
A
The area of a rectangle is 4.5 cm by 3.25 cm. What is the area keeping the correct significant figures. A 14.625 cm^2 B 14.63 cm^2 C 14.6 cm^2 D 15 cm^2
D
A diesel engine is 2.11 liters, where 1 liter = 1000 cm^3 . Express this volume in cubic inches. A 0.007 in^3 B 129 in^3 C 500 in^3 D 2110 in^3
B
A baseball is hit high and far. Which of the following statements is true? At the highest point, A the magnitude of the acceleration is zero B the magnitude of the velocity is zero C the magnitude of the velocity is the slowest D the direction of the acceleration is always negative
C
Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street? Neglect air resistance. A The one thrown up is traveling faster. B The one thrown down is traveling faster. C They are traveling at the same speed. D It is impossible to tell because the height of the building is not given.
C
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? A 10 mm B 20 mm C 40 mm D 80 mm
C
Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? A The speed of the object is constant but its velocity is not constant. B The acceleration of the object is +g when the object is rising and -g when it is falling. C The acceleration of the object is zero at its highest point. D The speed of the object is zero at its highest point. E The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
E
. A bank in downtown Stillwater is robbed. To elude police, the robbers escape by helicopter, making two successive flights by the following displacements: 40.0 m in a direction 60◦ north of east and then 30.0 m in a direction 15◦ north of east. At the end of the second flight they are captured. Find (draw and calculate) the resultant displacement of the robbers.
Rx = 48.97 Ry = 42.4 R = 64.72 -->R = 64.72 ; 40.92 N of E
Magnitude of displacement is the same as distance traveled. Is this statement true or false in general? a. False b. True
a
If you plotted x vs. t2, for an object falling from rest (assuming down to be positive), what should the graph look like? a. straight line b. positive slope c. y-intercept is zero (goes through origin) d. negative slope e. curve with increasing slope f. curve with decreasing slope g. y-intercept is negative h. y-intercept is positive
a, b, c
Which of the following quantities are scalars. a. distance b. velocity c. speed d. mass e. displacement f. weight
a, c, d
Given the kinematics equation for the motion of an object falling from rest, x=.5g*t2), what kind of relationship is predicted between x and t? (select all that apply) a. diplacement, x, is proportional to the square of the time, t2. b. x=k*t, where k is a constant c. x=k*t+b, where k and b are constants. d. displacement, x, is proportional to time, t. e. displacement, x, has a linear relationship with time, t. f. displacement, x, and time, t, obey a power law. g. x=k*t2, where k is a constant.
a, f, g
If the acceleration of an object is zero, then that object cannot be moving. a. False b. True
a.
If you drop a feather and penny in a vacuum ( no resistance), which one would hit the ground first? a. They will hit at the same time. b. The penny will hit first. c. The feather will hit first.
a.
Physical quantities are of two different types, scalars and vectors. Which of the following statements is correct: a. A vector quantity is specified by magnitude and direction b. A vector quantity can be specified by just magnitude c. Scalar and vector quantities are essentially the same d. A scalar quantity is specified by magnitude and direction
a.
The magnitude of the resultant of two vectors cannot be less than the magnitude of either of those two vectors. a. False b. True
a.
Which of the following statements is correct? a. Displacement and Velocity are vector quantities b. Distance and displacement are scalar quantities c. Speed, velocity and acceleration are vector quantities d. Speed and velocity are vector quantities
a.
. A car slows down from 27.3 m/s to rest with an acceleration that has a magnitude of 3.92 m/s2 . (a) Find the displacement of the car for this motion. (b) Find the time taken for it to stop
a. 95.06 m b.6.96 s
A projectile is shot from the edge of a cliff 115 m above ground θ0 = 35.0 ◦ with a speed of 65.0 m/s. Calculate: (a) time to reach the maximum height, (b) the maximum height from the edge of the cliff. (c) Determine the horizontal distance traveled from the base of the vertical cliff to the point it hits the ground. Given that, the time taken for this motion is 9.95 s.
a. t = 3.8 b. h = 70.9 c. Xf = 529.738
Which of the following quantities are vectors a. speed b. displacement c. velocity d. distance e. weight f. mass
b, c, e
A quantity that has both a magnitude with proper units as well as a directions is called a a. scalar b. vector
b.
A quantity that has only a magnitude with proper units is called a a. vector b. scalar
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. a. False b. True
b.
If you drop a feather and penny in air, which one would hit the ground first? a. They will hit at the same time. b. The penny will hit first. c. The feather will hit first.
b.
The magnitude of a vector can never be less than the magnitude of any of its components. a. False b. True
b.
When finding the magnitude of the sum of two vectors, you can directly add the magnitudes of the two vectors. a. True b. False
b.
A ball is thrown straight up. What are the velocity and acceleration of the ball at the highest point in its path? a. v=0,a=0 b. v=0,a=9.8m/s2UP c. v=0,a=9.8m/s2down d. v=9.8m/s,a=0
c.
When applying the equations of kinematics for an object moving in one dimension, which of the following statements must be true? a. The position of the object must increase with time. b. The velocity of the object must remain constant. c. The acceleration of the object must remain constant. d. The velocity of the object must always be in the same direction as its acceleration.
c.