物理
- Two boxes are connected by a string, as shown below. The string and pulley are massless, and m1+m
- A 70 kg person stands on one end of a one-meter long board. The board is uniform and weighs 100 k
- A thin uniform rod of mass M and length L is positioned vertically above an anchored frictionless
- A disk with a radius of 0 m and a rotational inertia of 0.40 kg·m2rotates with an angular speed
- A violin is played with an initial intensity what is the difference in soundintensity level (dB)
- An engine is designed to obtain energy from the temperature gradient of the ocean. What is the th
- If 10 kg of ice at 0 oC is mixed with 100 kg of water at 80 oC and is additionally heated with 46
- Some species of whales can dive to the depth of one kilometer. What is the approximate total pres
- A proton moves around a circular path (radius = 0 mm) in a uniform 0.25 T magnetic field. What
- A current loop freely rotates in a uniform magnetic field (B = 0.50 T). The maximum torque on th
- A 0 kΩ resistor and an initially uncharged 0 μF capacitor are connected in series to a 12 V
- A 3 μF capacitor is connected in series with a 6 μF capacitor. When a 300 V potential difference
- A magnetic field is directed out of the page. Two charged particles enter from the top and take
- In radioactive decays, which of the following statements is incorrect?(A) The energy, momentum,
- In X-ray spectrum, which of the following statements is correct?(A) The electron beam is acceler
- As the figure shows, a stone was thrown on the roof of height h=10 m from the throw. After 6 sec
- A 10 g bullet moving 1000 m/s strikes and passes through a 0 kg block initially at rest, as sh
- A box of mass 1 kg was placed on the edge of a rotating table with radius 10 cm, as shown below.
- A 10 N tangential force is applied at the edge of a 20 kg disk with a radius of 0 m. Then, the
- A uniform beam of weight 300 N and length 0 m is suspended horizontally. On the left it is hin
- A force is applied on a particle. What is the work done by the force as the particlemoves in an
- A single conservative force acts on a particle that moves along an x axis. The particle has mass
- In the figure, a block of mass m = 0 kg slides through a horizontal frictionless ground at a
- A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the
- A pipe open at both ends has a fundamental frequency of f..A second pipe closed at one end and o