尔雅Physics_1答案(学习通2023完整答案)
尔雅Physics_1答案(学习通2023完整答案)
Chapter 2~3 Test
1、尔雅Which of the following formulas is 答答案true for all types of motion?
A、
B、案学
C、习通
D、完整
2、尔雅Which of the following ideas is 答答案helpful in understanding projectile motion?
A、Acceleration is 案学+g when the object is rising and -g when falling.
B、The习通 horizontal motion is independent of the vertical motion.
C、The完整 velocity of the object is zero at the top point of parabola.
D、In the absence of friction,尔雅 the trajectory will depend on the object's mass as well as its initial velocity and launch angle.
3、
A、答答案
B、案学
C、习通
D、完整
4、If the motional equation of a particle is expressed as , which of the following statement is true?
A、It is a uniform circular motion.
B、The path is a parabola.
C、The radial acceleration is
D、The speed is v=2t.
5、If we choose two different reference frames to analyze the motion of an object, the description of motion can be different.
6、In 1-dimentional motion, if we know the accelaration of an object, then its velocity can be expressed as:
7、If a particle has a constant speed, its acceleration equals 0.
8、In a circular motion, the acceleration is always perpendicular to the velocity.
9、
10、
11、An object moving in r =100m circle satisfies: , how much is the magnitude of acceleration when t=1s?
12、Someone must get directly across a 160m wide river (from A to B) in the minimum time. The river's current is 0.8m/s, he can row a boat at 1.5m/s, and he can run 3m/s. Try to find the best path he can take, and what is the minimum time for the crossing? t = ________ s
Chapter 4 & 5 Dynamics: Newton's Laws and Application (2)
Chapter 4&5 Test
1、A conical pendulum composed of a massless rope (length L) and a bob (mass m) is shown in Figure. How much is the period for the pendulum?
A、
B、
C、
D、
2、A mass m slides down along a circular track (radius R) from position A with no friction. When it arrives the position as figure, how much is the normal force N acted by the track?
A、
B、
C、
D、
3、A person stands on a bathroom scale in an elevator. When the scale reads only 75% of the person’s regular weight, he claims that the elevator must be moving downward. Is he right?
4、Newton's laws can be used in any reference frame.
5、A small block of mass m is released on a triangular block of mass M. If at the same time a force is applied to M, m remains rest relative to M. (Assuming all surfaces are frictionless)
6、Newton's second law says: the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its ________. (one word)
7、
8、A 1500-kg car moving at 20m/s crosses the rounded top of a hill (treat as an arc of circle, radius 100m). What is the normal force N acted by the hill? (g=9.80m/s^2) N = _________ N
Chapter 9 Linear Momentum and Collisions (3)
Chapter 7~9 Test
1、A particle is suspended from a post on top of a cart by a light string as shown in Figure. The cart and particle are initially moving to the right at constant speed v, with the string vertical. The cart suddenly comes to rest when it runs into and sticks to a bumper. Which of the following statements is true about the collision process?
A、The linear momentum of the cart is conserved.
B、The linear momentum of the particle is conserved.
C、The linear momentum of the cart and linear momentum of the particle are both conserved.
D、The linear momentum of the cart and linear momentum of the particle are both not conserved.
2、A uniform thin equilateral triangle with the length of each edge is a. The position of CM (center of mass) is
A、
B、
C、
D、
3、A certain spring that obeys Hooke's law is stretched by an external agent. The work done in stretching the spring by 10cm is 4J. How much additional work is required to stretch the spring an additional 10cm?
A、4J
B、8J
C、12J
D、16J
4、A skier of mass m slides from rest at the top of a frictionless solid sphere of radius R. Then at what angle θ will he leave the sphere?
A、
B、
C、
D、
5、Consider a 2-Dimensional elastic collision between two identical balls, with one being a target initially at rest. What is the angle between their final velocity vectors?
A、0°
B、90°
C、180°
D、Any angle is possible.
6、The kinetic energy of an object depends on the reference frame in which its motion is measured.
7、A force acting on an object does no work on it, if the force is always perpendicular to the moving direction of object.
8、Only nonconservative forces can change the kinetic energy of an object.
9、The total momentum of a system remains constant in any case.
10、If there is an elastic collision between two objects, their total kinetic energy will not change.
11、
12、
13、
14、
15、Water is jetting at rate of R=1.5kg/s with v=20m/s on a car, and splashes back with v'=10m/s in the opposite direction. What is the force exerted on the car? F=_________N
Chapter 11 General Rotation (2)
Chapter 10~11 Test
1、Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the following statements is NOT true concerning this object?
A、If the angular speed is constant, the object has a zero acceleration.
B、The object has a tangential acceleration only if the disk has an angular acceleration.
C、The object always has a centripetal acceleration except when the angular speed is zero.
D、If the angular speed is constant, the speed of object is also constant.
2、Consider the orbital motion of a planet going around the Sun. Which of the following statements about the motion is true?
A、Only the mechanical energy of planet is conserved.
B、Only the angular momentum of planet is conserved.
C、Both the angular momentum and mechanical energy of planet are conserved.
D、Neithor of the angular momentum or mechanical energy of planet is conserved.
3、A bullet hits into a hanged uniform rod, the total momentum and total angular momentum of the system are both conserved after collision. Where does the bullet hit?
A、r = l /3
B、r = l /2
C、r = 2l /3
D、r = 3l /4
4、Consider 3 objects with the same mass m but different shapes (solid cylinder, solid sphere and cylindrical shell). They all roll down from rest on an incline without slipping, which one rolls fastest?
A、The solid cylinder.
B、The solid sphere.
C、The cylindrical shell.
D、They roll equally fast.
5、When you watch a clock hanging on a vertical wall, the direction of angular velocity of the second hand is perpendicular to the wall and pointing outside.
6、If we measure the rotational inertia of an object about different axes, we may obtain different values.
7、The angular momentum of a particle remains constant if there is no net torque acting on it.
8、Centrifugal force can be measured in noninertial frames, but it is not a real force, there is no object applying this force.
9、Calculate the magnitude of net torque on the rod in Figure about the axis through O perpendicular to the page.
10、A box is hanging on a pulley by massless rope, then the system starts to move without slip, How much is the acceleration of m?
11、How much is the rotational inertia I of a uniform thin disk (mass m, radius R), if the axis is along the line of its diameter?
12、
Chapter 14 Sound
Chapter 12~14 Test
1、An object of mass 0.50 kg, hanging from a spring with a spring constant of 8.0 N/m, is set into a simple harmonic motion. What is the maximum speed of the object if its maximum displacement is 0.10 m?
A、0.20m/s
B、0.40m/s
C、0.80m/s
D、1.60m/s
2、
A、0.5f
B、0.707f
C、1.414f
D、2f
3、Which of the following statements is NOT necessarily true regarding mechanical waves?
A、They are sinusoidal in nature.
B、They carry energy.
C、They require a medium through which to propagate.
D、The wave speed depends on the properties of the medium in which they travel.
4、Someone is adjusting a guitar. He changes the length of guitar string from L to 0.9L, and the tension in the guitar string from T to 1.1T. After the adjustment, the frequency of guitar will change from f to ______.
A、0.94f
B、0.99f
C、1.17f
D、1.22f
5、
A、
B、
C、
D、
6、A uniform circular motion on xoy plane can be treated as the superposition of a simple harmonic motion in x direction and another simple harmonic motion in y direction.
7、In a damped harmonic motion, the vibrational energy keeps decreasing over time.
8、When a wave travels in medium, the particles in medium will oscillate with the same frequency, same amplitude and same phase.
9、Consider an interference between two waves. At a certain position if the vibrations caused by two waves are in phase, they make a destructive interference.
10、When we speak, the sound wave can be treated as a spherical wave. The sound level is measured lower for a longer distance to the speaker, because the intensity of sound wave decreases over distance.
11、
12、
13、Two traveling waves make a standing wave, and the distance between two nodes is measured to be 10cm. What is the wavelength of traveling wave? λ=___________cm
14、
15、
Chapter 31 Diffraction & Polarization (3)
Chapter 30~31 Test
1、What combination of optical phenomena causes the bright colored patterns sometimes seen on wet streets covered with a layer of oil?
A、Diffraction and polarization.
B、Interference and diffraction.
C、Polarization and reflection.
D、Reflection and interference.
2、Suppose Young’s double-slit experiment is performed in air using red light, and then it is done again in water. What happens to the interference pattern on the screen?
A、The bright and dark fringes stay in the same locations, but the contrast is reduced.
B、The bright fringes are closer together.
C、The bright fringes are farther apart.
D、No change happens in the interference pattern.
3、A colorful band or spectrum can be shown on the screen when we use white light in a grating experiment. By adjusting which of the following parameters, we can obtain a wider band?
A、The distance between the light source and grating.
B、The width of each slit.
C、The grating constant.
D、The total number of slits.
4、When there is a superposition between two rays of light from two different electric bulbs, we can not see interference fringes, because the coherent condition is not satisfied.
5、We can see atoms by visible light through an optical microscope.
6、If the incident angle is greater than Brewster's angle, the reflection light will be plane-polarized.
7、White light (4000?~7000?) falls on a soap bubble (thickness t=3000?, n=1.3). Light at which wavelength is maximally strengthened in the reflecting light? λ = __________ ?
8、In the observation of single-slit diffraction, point P on the screen is the first-order bright fringe. How to change the width of slit so that we can observe the third dark fringe at P? From a to ______ a.
9、Natural light with intensity I and linear polarized light with intensity 3I both fall on a polarizer, the total transmitted intensity is 2I. What is the angle θ between the axis of polarizer and polarized direction of linear polarized light? θ = ________°
Final Exam
Final exam
1、In the Figure, as the ball rolls down the hill, what is correct about its motion?
A、both its speed and its acceleration increase.
B、its speed increase and its acceleration decrease.
C、both speed and acceleration decrease.
D、its speed decreases and its acceleration increase.
2、Consider the following controls in an automobile: gas pedal, brake, steering wheel. What are the controls in this list that cause an acceleration of the car?
A、all three controls
B、the gas pedal and the brake
C、only the gas pedal
D、only the steering wheel
3、A particle of mass m is exerted with a force. Which of the following forces is not a conservative force? (g, k, C, D and γ are constants, and υ is the speed of particle.)
A、
B、
C、
D、
4、If two particles have equal kinetic energies, are their momenta equal?
A、yes, always
B、no, never
C、yes, as long as their masses are equal
D、yes, if both their masses and directions of motion are the same
5、A constant net torque is exerted on an object. Which of the following quantities for the object can NOT keep constant? (a) angular position (b) angular velocity (c) angular acceleration (d) rotational inertia
A、(a)
B、(a)(b)
C、(a)(b)(c)
D、(a)(b)(c)(d)
6、A uniform solid cone (mass M, radius R, height h) rotates about its symmetric axis, its rotational inertia will be
A、
B、
C、
D、
7、Which of the following statements is NOT correct about inertial forces?
A、They are not real forces.
B、In reference frame of a space station, the spaceman cannot feel gravity because it is balanced by inertial force.
C、In a rotational noninertial frame, there is only one inertial force acting on moving objects: Coriolis force.
D、Because of the inertial force, gravity of objects is slightly different from the gravitational force acted by the Earth.
8、A block–spring system vibrating on a frictionless, horizontal surface with amplitude of 6.0 cm has energy of 12 J. If the block is replaced by one whose mass is twice the mass of the original block and the amplitude of the motion is again 6.0 cm, what is the energy of the system?
A、48J
B、24J
C、12J
D、6J
9、A traveling wave is shown by y=0.1cos(6x + 80t + π/3) (SI). Then the wave velocity is
A、80m/s
B、6m/s
C、480m/s
D、13.3m/s
10、Sound from a loudspeaker is measured to be 60dB at a distance of 3m. What is the sound level measured at a distance 6m?
A、30dB
B、50dB
C、54dB
D、57dB
11、In the double-slit interference experiment, the distance between two slits is d, and the screen is L away from the slits. We can change the experiment condition to see what happens to the interference pattern. Which of the following statements is NOT correct?
A、When the distance d increases, the interference fringes on screen are getting far away from each other.
B、When the distance L increases, the interference fringes on screen are getting far away from each other.
C、Remaining other conditions, do the experiment under water; the interference fringes on screen will be closer to each other.
D、Colorful fringes can be seen if sunlight is used as the incident light.
12、600-nm light falls on a single-slit (width a=0.3mm), the screen is 2.0m away. At diffraction angle θ=0.005rad, which fringe can be observed?
A、The first bright fringe.
B、The second bright fringe.
C、The first dark fringe.
D、The second dark fringe.
13、If plane polarized light is sent through two polarizers, the first at 45° to the original plane of polarization and the second at 90° to the original plane of polarization, what fraction of the original polarized intensity passes through the last polarizer?
A、0
B、1/2
C、1/4
D、1/8
14、Two spaceships move with same speed 0.80c relative to the Earth, but in opposite directions. What is the speed of one ship relative to the other? (c is the speed of light in vacuum)
A、0.80c
B、0.976c
C、0.994c
D、1.60c
15、
16、A rod of length 30.0 cm has linear density (mass per length) given by λ =50.0+20.0x where x is the distance from one end, measured in meters, and λ is in grams/meter. How far is its center of mass from the x =0 end? ___________cm
17、A small ball (m=50g) connected by a rope is moving on frictionless table circularly with ω =7rad/s and r=30cm. Then one pulls the rope slowly through the center. When the radius of circular motion reduces to r'=10cm, the work done on the ball is _____________J.
18、If the functional curve of VELOCITY in an oscillation is shown as figure, then the amplitude of oscillation is A = __________________cm.
19、
20、
21、The 3rd, 6th, 9th maxima are missing in a grating experiment, and the grating constant d=7200nm. What is the minimum possible value of slit width a? a = ________nm
22、
Final Exam
Final exam
1、In the Figure, as the ball rolls down the hill, what is correct about its motion?
A、both its speed and its acceleration increase.
B、its speed increase and its acceleration decrease.
C、both speed and acceleration decrease.
D、its speed decreases and its acceleration increase.
2、Consider the following controls in an automobile: gas pedal, brake, steering wheel. What are the controls in this list that cause an acceleration of the car?
A、all three controls
B、the gas pedal and the brake
C、only the gas pedal
D、only the steering wheel
3、A particle of mass m is exerted with a force. Which of the following forces is not a conservative force? (g, k, C, D and γ are constants, and υ is the speed of particle.)
A、
B、
C、
D、
4、If two particles have equal kinetic energies, are their momenta equal?
A、yes, always
B、no, never
C、yes, as long as their masses are equal
D、yes, if both their masses and directions of motion are the same
5、A constant net torque is exerted on an object. Which of the following quantities for the object can NOT keep constant? (a) angular position (b) angular velocity (c) angular acceleration (d) rotational inertia
A、(a)
B、(a)(b)
C、(a)(b)(c)
D、(a)(b)(c)(d)
6、A uniform solid cone (mass M, radius R, height h) rotates about its symmetric axis, its rotational inertia will be
A、
B、
C、
D、
7、Which of the following statements is NOT correct about inertial forces?
A、They are not real forces.
B、In reference frame of a space station, the spaceman cannot feel gravity because it is balanced by inertial force.
C、In a rotational noninertial frame, there is only one inertial force acting on moving objects: Coriolis force.
D、Because of the inertial force, gravity of objects is slightly different from the gravitational force acted by the Earth.
8、A block–spring system vibrating on a frictionless, horizontal surface with amplitude of 6.0 cm has energy of 12 J. If the block is replaced by one whose mass is twice the mass of the original block and the amplitude of the motion is again 6.0 cm, what is the energy of the system?
A、48J
B、24J
C、12J
D、6J
9、A traveling wave is shown by y=0.1cos(6x + 80t + π/3) (SI). Then the wave velocity is
A、80m/s
B、6m/s
C、480m/s
D、13.3m/s
10、Sound from a loudspeaker is measured to be 60dB at a distance of 3m. What is the sound level measured at a distance 6m?
A、30dB
B、50dB
C、54dB
D、57dB
11、In the double-slit interference experiment, the distance between two slits is d, and the screen is L away from the slits. We can change the experiment condition to see what happens to the interference pattern. Which of the following statements is NOT correct?
A、When the distance d increases, the interference fringes on screen are getting far away from each other.
B、When the distance L increases, the interference fringes on screen are getting far away from each other.
C、Remaining other conditions, do the experiment under water; the interference fringes on screen will be closer to each other.
D、Colorful fringes can be seen if sunlight is used as the incident light.
12、600-nm light falls on a single-slit (width a=0.3mm), the screen is 2.0m away. At diffraction angle θ=0.005rad, which fringe can be observed?
A、The first bright fringe.
B、The second bright fringe.
C、The first dark fringe.
D、The second dark fringe.
13、If plane polarized light is sent through two polarizers, the first at 45° to the original plane of polarization and the second at 90° to the original plane of polarization, what fraction of the original polarized intensity passes through the last polarizer?
A、0
B、1/2
C、1/4
D、1/8
14、Two spaceships move with same speed 0.80c relative to the Earth, but in opposite directions. What is the speed of one ship relative to the other? (c is the speed of light in vacuum)
A、0.80c
B、0.976c
C、0.994c
D、1.60c
15、
16、A rod of length 30.0 cm has linear density (mass per length) given by λ =50.0+20.0x where x is the distance from one end, measured in meters, and λ is in grams/meter. How far is its center of mass from the x =0 end? ___________cm
17、A small ball (m=50g) connected by a rope is moving on frictionless table circularly with ω =7rad/s and r=30cm. Then one pulls the rope slowly through the center. When the radius of circular motion reduces to r'=10cm, the work done on the ball is _____________J.
18、If the functional curve of VELOCITY in an oscillation is shown as figure, then the amplitude of oscillation is A = __________________cm.
19、
20、
21、The 3rd, 6th, 9th maxima are missing in a grating experiment, and the grating constant d=7200nm. What is the minimum possible value of slit width a? a = ________nm
22、
相关日志：
moocC程序设计期末答案(慕课2023课后作业答案)
中国大学仓储作业管理_2章节答案(慕课2023完整答案)
尔雅高分子材料期末答案(学习通2023课后作业答案)
超星实用英语_2章节答案(学习通2023完整答案)
中国大学妇产科学_4课后答案(mooc完整答案)
智慧树十九世纪欧洲文学家与作品课后答案(知到2023测试答案)
超星数学分析2（二）课后答案(学习通2023题目答案)
尔雅基础英语1课后答案(学习通2023课后作业答案)
中国大学液压与气压传动及润滑技术课后答案(慕课2023课后作业答案)
超星儿童文学_1答案(学习通2023题目答案)