CSCA Physics Official Sample

Which of the following statements is correct?

The elasticity coefficient of a spring is 200 N/m. If the spring extends by 0.2 m, how much force is needed?

As shown in the figure, an object with a mass of 6 kg is stationary on a horizontal tabletop, and a force F of 10 N is applied horizontally to the right. The dynamic friction coefficient between the object and the ground is μ = 0.2, and the gravitational acceleration is 10 m/s2. Therefore, the resultant force acting on the object is:

A particle is subjected to three horizontal forces, with magnitudes of 3 N, 4 N, and 5 N, respectively. The minimum and maximum values of the combined force of these three forces are:

If the displacement-time graph of a moving object in a straight line is shown in the figure, then:

When an object undergoes a free fall motion, if g = 10 m/s2, the velocity of the object at the end of 5 seconds is:

A particle moves uniformly in a circular motion at a speed of v = 4 m·s−1, and the radius of the circular motion is R = 1 m. Therefore, the period T of the motion is:

A mechanical wave with a wavelength of 4 m and a propagation speed of 120 m/s has a frequency of:

Using a horizontal pulling force F of 35 N to pull an object with a mass of 5 kg, if the object moves forward 10 meters on a smooth horizontal plane, then the kinetic energy of the object:

The total resistance value of two resistors connected in parallel is R = 30 Ω. If the resistance value of one resistor is R1 = 60 Ω, then the resistance value of the other resistor is:

As shown in the diagram, in a uniformly strong electric field with an electric field strength of E, a positive point charge with a charge quantity of q moves along the direction of the electric field line from point A to point B. The distance between points A and B is d. During this process, the work done by the electric field force on the charge is equal to:

On the same straight line at points A, B and C, an object undergoes uniform acceleration motion starting from point A, with a velocity of 0 at point A. When passing through point B, the velocity is 2 m/s, and when reaching point C, the velocity is 4 m/s. Therefore, the ratio of the distances between AB and BC is:

The object is subjected to a constant force F as shown in the figure, moving on a smooth horizontal plane within time t, then:

The I-U graphs of two fixed resistors R1 and R2 are shown in the figure. Which of the following statements is correct regarding the size of R1 and R2, as well as the position where their I-U graphs are located when the resistors are connected in series or parallel?

A motor with a rated voltage of 100 V and a resistance value of 2 Ω. When operating normally, the current passing through it is 3 A. The power loss of the motor due to heating is:

After charging a parallel plate capacitor, it is disconnected from the power supply and the negative plate is grounded. There is a positive charge (with a small amount of charge) fixed at point P between the two plates, as shown in the figure. E represents the field strength between the two plates, U represents the voltage of the capacitor, and EP represents the potential energy of the positive charge at point P. If the negative plate is kept stationary and the positive plate is moved to the position shown by the dotted line in the figure, which of the following statements is correct?

In a uniformly strong magnetic field of B = 2 T, an object with a mass of m = 1 kg and a positive charge of q = 1 C moves to the left along a smooth insulated horizontal plane at an initial velocity of v0 = 10 m/s, as shown in the figure. Taking g = 10 m/s2, the magnitude of the resultant force acting on the object during the motion is:

As shown in the figure, the two ends of parallel metal rails placed horizontally are connected with a resistor R. The wire ab can slide on the frame without friction, and a uniform magnetic field passes vertically through the frame plane. When ab moves uniformly to the right, which of the following statements is correct?

As shown in the figure, the smooth fixed rails m and n are placed horizontally, and two conductor bars p and q are placed parallel on the rails to form a closed loop. When a bar magnet falls from a height and approaches the circuit (regardless of air resistance), then:

The pattern of the magnetic flux passing through a fixed and stationary wire frame over time is shown in the figure. Which of the following statements is correct?