- In the simple harmonic motion, when the displacement has its maximum magnitude, the restoring force and the acceleration of the body have their maximum magnitudes. （ ）
- The loop integral of the force in the conservative force field may not be zero. （ ）
- An object may have a constant speed but the varying velocity. （ ）
- In many important situations including waves on a string, the wave speed is determined entirely by the mechanical properties of the medium. （ ）
- In the simple harmonic motion, when the body is at either its maximum positive displacement, or its maximum negative displacement, the velocity is zero and the body is instantaneously at rest. （ ）
- An array of a large number of parallel slits, all with the same width and spaced equal distances between centers, is called a diffraction grating. （ ）
- Kinetic friction force is a nonconservative force. （ ）
- When the particle’s velocity is zero, the acceleration must also be zero. （ ）
- A car travels at a constant speed along a straight level road, and the road does no work on the car. （ ）
- In a transverse wave, the displacements of the medium are perpendicular or transverse to the direction of travel of the wave along the medium. （ ）
- In the simple harmonic motion, the magnitude of its acceleration is directly proportional to the displacement from equilibrium, and the direction is always opposite to the displacement, but always points to the equilibrium. （ ）
- The instantaneous velocity is equal to the slope of the tangent line at that point. （ ）
- The resolution of a telescope improves with larger diameter. （ ）
- The radical acceleration corresponds to the changes in the particle’s direction of motion. （ ）
- If the external force on the object is zero, the object must be at rest. （ ）
- Two monochromatic sources of the same frequency and with a constant phase relationship (not necessarily in phase) are said to be coherent. （ ）
- Fraunhofer diffraction is used for situations in which the source, obstacle, and screen are far enough apart that we can consider all lines from the source to the obstacle to be parallel, and can likewise consider all lines from the obstacle to a given point on the screen to be parallel. （ ）
- Anywhere on earth, gravity equals universal gravitation （ ）
- The direction of polarization of an electromagnetic wave is defined to be the direction of the electric-field vector. （ ）
- Both the displacement and distance are related to the selection of the origin of coordinate. （ ）
- A particle is moving straight along the x direction, and its position is determined by the equation , where the unit of x is meter, and the unit of t is second. Then its acceleration is expressed as ( ).
- A man throws an iron ball horizontally from the roof of a building. After 6s, the ball lands, (air resistance is not recorded) ( .w64983229364s .brush0 { fill: rgb(255,255,255); } .w64983229364s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229364s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64983229364s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64983229364s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229364s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64983229364s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 10/ gms = ) How high is the building? （ ）
- The kinematic motion a particle is determined by the equations ，then its acceleration is expressed as ( ).
- A 50-kg boy throws a ball of mass 0.5kg against a wall. The ball strikes the wall horizontally with a speed of 10 m/s, and it bounces back with the same speed. The ball is in contact with the wall for 0.05 s. The average force exerted on the wall by the ball is closest to （ ）
- Suppose a sinusoidal plane wave is expressed as , then the wavelength is （ ）
- Which of the following is not conservative force （ ）.
- In the Young's experimental setup, the wavelength of the light source is 640 nm, the distance between the two slits is 0.4 mm, and the distance between the screen and the slit is 50 cm. What is the distance between the first bright fringe and the central bright fringe on the screen? （ ）
- An object with a mass of 2kg is thrown vertically upward at an initial velocity of 10m/s. When it moves to the highest point, the impulse of the object is （ ）.
- Two plates of glass are in contact at one end and separated by a thin wire with diameter of 0.05 mm at the other end to form a thin air wedge. The length of the glass plate is L=20cm. The light with a wavelength .w64983229353s .brush0 { fill: rgb(255,255,255); } .w64983229353s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229353s .font0 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229353s .font1 { font-style: italic; font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229353s .font2 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229353s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 680nm l = is normally incident on the air wedge. How many bright lines are observed on the top glass plate? （ ）
- Find the maximum horizontal range R of a projectile launched with the speed of 15 m/s and at an initial angle 35° with respect to horizontal direction. The air resistance is negligible. （ ）
- Two plates of glass are in contact at one end and separated by a thin wire with diameter of 0.05 mm at the other end to form a thin air wedge. The length of the glass plate is L=20cm. The light with a wavelength .w64983229382s .brush0 { fill: rgb(255,255,255); } .w64983229382s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229382s .font0 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229382s .font1 { font-style: italic; font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229382s .font2 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229382s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 680nm l = is normally incident on the air wedge. What is the distance spacing between two successive bright fringes （ ）
- In simple harmonic motion, the velocity v is generally expressed as （ ）.
- In the Cartesian coordinate system, the cosine values of any position vector can be expressed as ( ).
- Visible light with a wavelength of 400 ~ 760nm is normally incident on a glass plate with a thickness of .w64983229336s .brush0 { fill: rgb(255,255,255); } .w64983229336s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229336s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64983229336s .font1 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229336s .font2 { font-weight: bold; font-size: 241px; font-family: Symbol, serif; } .w64983229336s .font3 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229336s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 6 1.210m - ´ and a refractive index of 1.5. Which is not the wavelength of the reflected light （ ）
- The formula expression of Brewster's law is （ ）
- The velocity of a particle moving along the x-axis is given by .w64983229368s .brush0 { fill: rgb(255,255,255); } .w64983229368s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229368s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64983229368s .font1 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229368s .font2 { font-style: italic; font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64983229368s .font3 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229368s .font4 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229368s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 4 x vt =+ , where t is in seconds and .w64983229352s .brush0 { fill: rgb(255,255,255); } .w64983229352s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229352s .font0 { font-style: italic; font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64983229352s .font1 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229352s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } x v is in meters per second. At .w64983229337s .brush0 { fill: rgb(255,255,255); } .w64983229337s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229337s .font0 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229337s .font1 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229337s .font2 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229337s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 3 ts = , the particle is located at .w64983229328s .brush0 { fill: rgb(255,255,255); } .w64983229328s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229328s .font0 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229328s .font1 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229328s .font2 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64983229328s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 9 xm = . The particle’s equation of motion is （ ）
- A bullet passes horizontally through two blocks of wood placed side by side, motionless, on a smooth surface. If the bullet is subjected to a constant resistance F inside the block and the mass of the block is m1 and m2, then what is the speed of the first block after the bullet passes through? ( )
- A man throws an iron ball horizontally from the roof of a building. After 3s, the ball lands. If the ball falls to the ground, the angle between the ball's motion direction and the horizontal direction is 37° (air resistance is not recorded, .w64983229347s .brush0 { fill: rgb(255,255,255); } .w64983229347s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229347s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64983229347s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64983229347s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229347s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64983229347s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 10/ gms = , sin37 °=0.6). How fast is the iron ball when it lands? （ ）
- A bullet of mass m=10g and v=200m/s speed was shot into the wood block. The average resistance of wood blocks is 5000N. Then the work done by resistance is （ ）.
- When lifting a 4.0 tons object with a crane, the cable can bear a maximum tension of 5.0 tons. The weight of the cable itself can be ignored. When the object is suspended in the air and stationery, what is the tension on the cable? ( )
- The height of the net for men's volleyball is 2 m. The size of the court on both sides of the net is 9.0m×9.0m. A player, in a jump serve position, hits the ball at a height of 2.5 m and a horizontal distance of 3 m from the net. What is the speed of hitting the ball so that the ball neither hits the net nor goes out of bounds (Given .w64983229302s .brush0 { fill: rgb(255,255,255); } .w64983229302s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64983229302s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64983229302s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64983229302s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64983229302s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64983229302s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 10/ gms = ). （ ）
- The kinematic motion a particle is determined by the equation . Then its acceleration is expressed as ( ).
- The simple harmonic motion is generally expressed as （ ）.
- A roadway is designed for traffic moving at a speed of 20 m/s. A curved section of the roadway is a circular arc of 100 m radius. The roadway is banked so that a vehicle can go around the curve with no lateral friction force. The angle at which the roadway is banked is closest to （ ）
- A length of 30cm, maximum strength T=1.0kg rope is tied with a mass m=500g ball. If the ball is stationary, how much horizontal impulse must be applied to the ball to break the string? （ ）
- A thin layer of benzene (n = 1.501) ties on top of a sheet of fluorite (n =1.434) It is illuminated from above with light whose wavelength in benzene is 400 nm. Which of the following possible thicknesses of the benzene layer will maximize the brightness of the reflected light?（ ）
- In a diffraction grating that has 400 slits per millimeter, the incident light is the sodium spectrum at a wavelength of 589nm, what is the maximum order that can be observed when the light is incident normally? （ ）
- Near-field diffraction or Fresnel diffraction describes the situation in which both the point source and the screen are relatively close to the obstacle forming the diffraction pattern. （ ）
- If a wave encounters a barrier that has an opening of dimensions similar to the wavelength, the part of the wave that passes through the opening will diffract into the region beyond the barrier. （ ）
- Which of the following single slit diffraction experiments has the smallest size of the angle from the center of the diffraction pattern to the first dark fringe? （ ）
- In the single-slit diffraction pattern, as the wavelength of the incident light increases, the central maximum will （ ）.
- The refractive index of soap film in the air is 1.33 and the thickness is 0.4μm. If white light (400 ~ 760nm) is incident normally, what color may the soap film show?（ ）
- What is the thickness difference between the adjacent bright interference fringes in the thin-film interference of a transparent wedge? （ ）
- Natural light is incident normally on a 380nm thick soap film in the air. If the refractive index of the soap film is 1.33, which wavelengths of light is constructively interfered on the front side of the soap film? （ ）
- The green light with the wavelength of 500 nm is incident on the double slits with the spacing d of 0.022 cm, and interference fringes are formed on the screen with the distance D of 180 cm. What is the spacing between two successive bright fringes（ ）.
- The red light with the wavelength of 700 nm is incident on the double slits with the spacing d of 0.022 cm, and interference fringes are formed on the screen with the distance D of 180 cm. What is the position of the second order bright fringe from the central bright fringe? （ ）
- Malus’s law is expressed as: （ ）
- when the angle of incidence is equal to the polarizing angle (Brewster’s angle) the reflected ray and the refracted ray are perpendicular to each other. （ ）
- The direction of polarization of an electromagnetic wave is defined to be the direction of the magnetic-field vector. （ ）
- The unpolarized light with intensity of .w64932155249s .brush0 { fill: rgb(255,255,255); } .w64932155249s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155249s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64932155249s .font1 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155249s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 0 I is incident on two parallel ideal polarizers, if the angle between the axes of the two filters is 60º, the intensities transmitted through the second polarizer is （ ）.
- What is the Brewster angle when light is incident from glass ( .w64932155273s .brush0 { fill: rgb(255,255,255); } .w64932155273s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155273s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64932155273s .font1 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155273s .font2 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155273s .font3 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64932155273s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 1.5 n = )onto the surface of air ( .w64932155259s .brush0 { fill: rgb(255,255,255); } .w64932155259s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155259s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64932155259s .font1 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155259s .font2 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155259s .font3 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64932155259s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 1 n = )？（ ）
- You are standing on the shore of a lake. You spot a tasty fish swimming some distance below the lake surface. If instead you use a high-power laser to simultaneously kill and cook the fish, should you aim the laser （ ）.
- You are standing on the shore of a lake. You spot a tasty fish swimming some distance below the lake surface. If you want to spear the fish, should you aim the spear （ ）.
- the frequency of the wave does not change when passing from one material to another. （ ）
- The index of refraction depends not only on the substance but also on the wavelength of the light. （ ）
- The angle of reflection is equal to the angle of incidence for all wavelengths and for any pair of materials. （ ）
- A block attached to a hanging ideal spring oscillates up and down with a period of 10 s on earth. If you take the block and spring to Mars, where the acceleration due to gravity is only about 40% as large as on earth, what will be the new period of oscillation? （ ）
- In simple harmonic motion the period and frequency do not depend on the amplitude. （ ）
- Oscillation can occur only when there is a restoring force tending to return the system to equilibrium. （ ）
- Set T as the period, .w64932155252s .brush0 { fill: rgb(255,255,255); } .w64932155252s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155252s .font0 { font-style: italic; font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64932155252s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } n as the frequency and .w64932155282s .brush0 { fill: rgb(255,255,255); } .w64932155282s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155282s .font0 { font-style: italic; font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64932155282s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } w as the angular frequency. Which of the following expression is incorrect （ ）?
- In simple harmonic motion, the acceleration a is generally expressed as （ ）.
- An object with a mass of 15kg is placed on the bottom plate of a crane. If the bottom plate of the crane accelerates up and the acceleration is . Given , the impulse of the object given by the bottom plate of the crane within 2 seconds is （ ）.
- An object with a mass of 2kg is thrown upward at the speed of 10m/s with an inclination angle of 30º, the magnitude of impulse received by the object when it moves to the highest point is （ ）.
- A static object burst into three pieces, two of which have the same mass, and the same speed of 20m/s with the direction of perpendicular to each other. The mass of the third piece is exactly equal to the sum of the other two pieces, then the speed of the third piece is （ ）.
- when the impulse is constant, the longer the action time, the smaller the impulse. （ ）
- For an isolated system, the total momentum of the system is conserved when the vector sum of the external forces is zero. （ ）
- The work done by the net force on a body is equal to the amount that the kinetic energy of the body increases. （ ）
- A bullet of mass m=10g and v=200m/s speed was shot into the wood block. The average resistance of wood blocks is 5000N. Then the depth of bullet entry is （ ）.
- In a hydroelectric generating station, falling water is used to drive turbines (“water wheels”), which in turn run electric generators. Compared to the amount of gravitational potential energy released by the falling water, how much electrical energy is produced? （ ）
- The theorem of kinetic energy of a particle follows that the amount of work done is independent of the path. （ ）
- How much work is done by the force F acting on a body when the body moves from x=0m to x=2.0m under the force of .w64932155281s .brush0 { fill: rgb(255,255,255); } .w64932155281s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155281s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64932155281s .font1 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155281s .font2 { font-style: italic; font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155281s .font3 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64932155281s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 3 6N Fx =- ? （ ）
- Suppose an astronaut landed on a planet where g=19.6 m/s2. Compared to earth, would it be for her to catch a ball that is moving horizontally at 12 m/s? (Assume that the astronaut’s spacesuit is a lightweight model that doesn’t impede her movements in any way.) （ ）
- Consider a box that is placed on different surfaces. In which situation(s) is there no friction force acting on the box? ( )
- Satellites are held in orbit by the force of our planet’s gravitational attraction. A satellite in a small-radius orbit moves at a higher speed than a satellite in an orbit of large radius. Based on this information, what you can conclude about the earth’s gravitational attraction for the satellite? （ ）
- A traffic light of weight w hangs from two lightweight cables, one on each side of the light. Each cable hangs at a 45° angle from the horizontal. What is the tension in each cable? （ ）
- The person in the elevator holds a spring scale with a heavy object. Now the reading of the spring scale suddenly becomes larger (The person never moves). What is the movement of the elevator at this time? （ ）
- A car moves at constant speed in a horizontal of radius 20.0 m, making a complete circle in 7.0 s. What is the acceleration of the car? （ ）
- The magnitude of the acceleration of the object may be very large, while the magnitude of the velocity of an object can remain unchanged. （ ）
- Velocity is a vector, and speed is also a vector. （ ）
- A particle is moving straight along the x direction, and its position is determined by the equation , where the unit of x is meter, and the unit of t is second. Then its velocity is expressed as （ ）
- Vector operation. If , and , find the value of , such that the vectors and will be perpendicular to each other （ ）.
- How many years older will you be 1.00 gigaseeond from now? (Assume a 365-day year.) （ ）
- Scientific notation: .w64932155254s .brush0 { fill: rgb(255,255,255); } .w64932155254s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64932155254s .font0 { font-weight: bold; font-size: 260px; font-family: "Times New Roman", serif; } .w64932155254s .font1 { font-weight: bold; font-size: 406px; font-family: "Times New Roman", serif; } .w64932155254s .font2 { font-weight: bold; font-size: 373px; font-family: Symbol, serif; } .w64932155254s .font3 { font-weight: bold; font-size: 374px; font-family: 宋体; } .w64932155254s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 3 3.610+230= ´ ？ （ ）
答案:对
答案:错
答案:对
答案:对
答案:对
答案:对
答案:对
答案:错
答案:错
答案:对
答案:对
温馨提示支付 ￥3.00 元后可查看付费内容,请先翻页预览!
