Thousands of Goddesses in the World

I said it wrong before. When the equilateral triangle (from horizontal to vertical) is released, the height of the center of gravity is equal to square root 3 side length and 60 degrees multiplied by two-thirds.

What I said before is also wrong. The descending height of the center of gravity of an equilateral triangle is 60 degrees times two-thirds of the side length. The distance from the center of the equilateral triangle to each vertex is equal to two-thirds of the height of a side.

The mechanical energy of a single ball is not conserved, only the mechanical energy of the entire system is conserved.

The induced electromotive force is equal to the change in magnetic flux over time.

The incidence of X-linked recessive diseases is greater in men than in women.

Hormones are transported throughout the body with the blood, but they only act on target organs and cells.

Plasma cells cannot recognize antigens.

Multiple vaccinations with inactivated vaccines can stimulate the rapid proliferation and differentiation of memory cells, produce more memory cells and antibodies, and improve the body's immune response.

Age structure affects birth and death rates, and the results of mark-and-recapture surveys are higher than the actual values. A community refers to a collection of various organisms that gather in a certain area at the same time.

Resistance is equal to resistivity times L to S.

The amount of charge is equal to the magnetic flux ratio to the total resistance.

When the coil enters the magnetic field (from bottom to top), the combined force of gravity and Ampere's force provides acceleration (the coil has an initial velocity, and both Ampere's force and gravity hinder its upward movement) During the process of the coil entering and exiting the magnetic field, Ampere's force always does negative work, so the speed of the coil when rising is greater than the speed when falling at the same position. The process of the coil entering the magnetic field takes a short time, and the impulse of gravity when the coil enters the magnetic field is smaller than the impulse of gravity when it exits the magnetic field. If the Ampere force is equal to the gravity when the coil leaves the magnetic field, the coil will pass through the magnetic field boundary at a constant speed.

If the question requires measuring multiple sets of data, the ammeter should be connected externally. The resistance of the sliding rheostat is small, so the partial voltage connection method is used.

The (gas) pressure below is equal to the relative length of the mercury column imposed by the (gas) pressure above. To answer questions about atmospheric pressure, you need to clarify the known conditions first.

When the temperature is changed, the gas sandwiched between the two liquids (mercury) undergoes an isobaric change.

Doing material questions requires us to filter and integrate the information in the text and summarize the key points of the content. When answering the first big question, you can copy the original text for the first sentence, and then write what you read.

The ratio of the central angle (greater than 90 degrees) enclosed by the trajectory of the particle in the magnetic field to 2 multiplied by the period T is the time for the particle to move in the magnetic field.

For a circle with p(a, b)M(1,2) as the diameter, the equation is (X-a)(X-1)+(y-b)(y-2)=0

The negative plate of the capacitor is grounded, and the positive plate is connected to the metal ball of the electrometer. The two remain in an open circuit state (the circuit is blocked and no loop is generated), which will not cause the capacitor to charge or discharge, and the charge Q between the plates remains unchanged. The capacitance Q and the plate spacing d are inversely proportional to each other.

The angle in the question stem may already imply the range of coordinates.