Conversion between kilowatt hour and kilowatt hour

Conversion between kilowatt hour and kilowatt hour

1:1

The height of the 10 members of the school basketball team are: 162, 163, 158, 160, 159, 162, 158, 157, 161, 160 cm, which can be used in several simple ways
How to calculate their average height?

In addition to the normal algorithm (that is, add these 10 numbers and divide them by 10), there are two simple methods as follows:
1. In 162, 163, 158, 160, 159, 162, 158, 157, 161, 160,
162 and 158 offset each other, 163 and 157 offset each other, 159 and 161 offset each other, leaving two 160
The average height is 160
2. Subtract 160 from each height to get:
2、3、-2、0、-1、2、-2、-3、1、0
Add these numbers to get 0
The average height is 160
I hope I can help you~~

Electric quantity = current * time, so electric work = electric quantity * voltage,

Yes
Because w = uit = UQ

If you divide a rope 3M long into 7 points on average, how can you express 3 / 7 of it

One is three seventh of a meter, so three is nine seventh of a meter
I hope you can be satisfied with my answer!

In the international system of units, the unit of time is (), and the symbol is (). Laboratories often use () to measure time intervals
Xiaogang's stopwatch position diagram at the end of a long-distance race shows that the time is () min () s and () s

In the international system of units, the unit of time is (s), and the symbol is (T)
No picture

10. (16 points) as shown in the figure, the trolley with mass M1 = 0.3KG is stationary on a smooth horizontal plane, the length of the trolley is L = 1.5m, the existing mass M2 = 0.2kg can be regarded as the material block of the particle, and it slides onto the trolley from the left end at a horizontal right speed V0 = 2m / s, and finally keeps relatively stationary with the trolley at a certain place on the car surface. The dynamic friction coefficient between the material block and the car surface μ = 0.5, take g = 10m / S2, and calculate
(1) Sliding time of the block on the vehicle surface T:
(2) In order to prevent the block from sliding out of the right end of the trolley, the speed of the block sliding on the left end of the trolley shall not exceed much
First of all, we use the momentum conservation m2v0 = (M1 + m2) VCOM to calculate VCOM, and then use VCOM = V0 at to calculate the time. Why is the result wrong?

Let the sliding time of the block on the surface of the car be t, the friction force F = um2g = 0.5 * 0.2 * 10 = 1, the acceleration a = 5 V = V0 at, that is, 0.8 = 2-5t, t = 0.24s2. The car with mass M1 = 0.3KG is friction

The 220v100w bulb is connected to 110V power supply, (1) what is the resistance of the bulb, (2) the actual power consumption of the bulb, (4) the total power consumption
(3) Connect the light bulb to the 335V power supply. What is the resistance of the light bulb in series

(1) Constant resistance, 484 ohm (square of rated voltage, rated power)
(2) The voltage is half of the rated voltage, the actual power is one fourth of the rated power, and the size is 25W (the actual power is equal to the square resistance of the actual voltage)
(3) The bulb resistance is 484 ohm, the voltage is 220 V, and the series resistance is 115 V, so the series resistance is 253 ohm (the current is equal)

The density of a is 3 × 103 kg / m3, and the density of B is 9 × 103 kg / m3. If both of them are put into a water container, then ()
A. The buoyancy ratio of metal blocks a and B is 1:3. B. the buoyancy ratio of metal blocks a and B is 1:1. C. the pressure ratio of metal blocks a and B to the bottom of the vessel is 1:3
D. The ratio of the pressure of a and B metal blocks to the bottom of the container is 1:4?
B. The buoyancy ratio of metal blocks a and B is 1:1

Solid metal block, P gold > P water, V row = v
F floating = pwater * VG
Buoyancy ratio = volume ratio = 1:1
Pressure on the bottom of the vessel f = gravity g-buoyancy pwater * VG
F = G-P water * VG = P gold * vg-p water * VG = (P gold-p water) VG
The ratio of pressure to the bottom of the vessel = = (P gold A-P water): (P gold B-P water)
=(3 * 10 ^ 3-1 * 10 ^ 3): (9 * 10 ^ 3-1 * 10 ^ 3) = 2:8 = 1:4. D pair

Area formula of isosceles right triangle

The formula is 1 / 2 × right angle side;

As shown in the figure, two objects a, B are stacked on the light spring vertically placed on the horizontal plane. The masses of a and B are 2kg. They are in a static state. If a 10N vertical downward force is suddenly applied to object a, and if the acceleration of gravity g = 10m / s2, the pressure of a on B is ()
A. 22.5NB. 20NC. 25ND. 30N

The whole body AB is balanced by gravity and supporting force. The resultant force is zero, so the supporting force of spring is 40n. Suddenly, a vertical downward pressure of 10N is applied to body A. for ab as a whole, the resultant force is equal to the pressure by gravity, spring force and pulling force. According to Newton's second law, f = 2mA is substituted into the data solution