A spring dynamometer, two people pull its two ends with horizontal tension, at this time the reading of the spring dynamometer is 20n, then the force of the two people is () A. Two people use 10N force B. two people use 20n force C. one person uses 20n force, the other person does not use force D. one person uses 5N force, the other person uses 15N force

A spring dynamometer, two people pull its two ends with horizontal tension, at this time the reading of the spring dynamometer is 20n, then the force of the two people is () A. Two people use 10N force B. two people use 20n force C. one person uses 20n force, the other person does not use force D. one person uses 5N force, the other person uses 15N force

When the dynamometer is at rest, it means that two people pull it in the opposite direction along the horizontal direction. At this time, the spring dynamometer is affected by a pair of balanced forces in the horizontal direction, so each of them uses a force of 20n

In the normal use of ideal transformer, if the load resistance on the secondary coil decreases, how will the power obtained by the original coil from the power supply (increase, unchanged, decrease)? Please explain the reason

Increase
Reason: for an ideal transformer, its input power (obtained from the power supply by the original coil) is equal to the output power (used for load operation). When the load resistance on the secondary coil decreases, its current increases, that is, its power increases, so the input power also increases

Is it correct that the controller can understand, interpret and execute all the instructions and store the results? Why?

No, the controller can explain, but cannot execute and store

On the computational space of memory
I'm sorry I forgot to type a question
In a 16 bit computer, the CPU can output 20 bits of address code. A 2K * 4 (bit) SRAM chip will be used to form a byte addressable memory
(1) What is the total capacity of the memory?
(2) How many RAM chips are needed?
(3) Which bit address code is used to select RAM chip? Which bit address code is used to select on-chip address?
Please tell me the calculation steps and why, because my younger brother is a rookie, if you speak well,

First of all, Zixuan's answer is absolutely wrong, because he doesn't even know what is a storage unit and what is a byte. What he should explain is a storage unit
If addressing by byte, a byte is composed of 8 binary bits, and because the output address code of CPU is 20 bits, that is, its address bus width (bits) is 20, the addressing range that CPU can support is 1MB, that is, it can support 2 ^ 20 * 8 bits
So I can answer your question
1: The total memory capacity can reach 1MB
2: It can be seen from the above that the memory is 1m * 8bit
So there are (1024 / 2) * (8 / 4) = 1024 SRAM to make up the memory
In other words, two pieces of 1 m * 2 bit SRAM bits are expanded to form 1 m * 8 bit SRAM, and 512 pieces of SRAM words are expanded to form 1 m * 2 bit memory
3. Because this SRAM chip has 9-bit address to select (because there are 512 SRAM word extensions to form 1m * 2bit SRAM). Generally, the high-order address is used for chip selection, so it is a11-a20. Because the composition element is 2K * 4 (bit), the on-chip address should be 11 bits, namely a0-a10. In this way, all address lines are used
Note: it can also be explained here that the number of bits of the external data line of CPU, that is, the data line connecting the memory, is 8 bits, that is, 8 data lines. This is because the memory is addressed by bytes
Is the answer OK? I hope to get your score

Choose and explain
___ alloy may be used to replace cooper
a such a
b some such
c such some
d several such

A

First grade Xiao Zhu and his father: who is faster to climb Baiyun Mountain? Father strides three levels in one step, while Xiao Zhu, who starts at the same time, strides two levels in one step. As a result, father and daughter arrive at the top of the mountain at the same time
A. Dad is fast
B. Xiaozhu's speed is fast. C. father's climbing power is high. D. Xiaozhu's climbing power is high
Why C

According to the meaning of the question, obviously, Dad's quality is big, so dad does more work, so he has more power
Power and speed are not the same, can be derived from the formula

Multiple choice questions about power
It took 20 seconds to walk from the ground floor to the third floor, and the power of work was the closest______ tile
A.10~20
B.100~200
C.800~1000
D.1500~2000

The weight of an adult is 600N, the height of one floor is 3M, and the height of the third floor is 6m
W=Gh=600N*6m=3600J
P=W/t=3600J/20s=180w

On the multiple choice questions of energy conversion into electric energy
Many forms of energy existing in nature can be easily converted into electrical energy. In the following analysis on the conversion of concentrated energy into electrical energy, the correct one is ()
A thermal power generation is to convert the chemical energy of combustion into electrical energy
B wind power is to convert the mechanical energy of the flowing air into electrical energy
C hydropower is to convert the mechanical energy of running water into electrical energy
D solar power generation is the conversion of solar energy into electricity
If which option is wrong, please explain the correct answer
Wait online

I think ABC is all wrong, or all four are right. First of all, a should be the chemical energy of combustion converted into the internal energy of steam, and then converted into the mechanical energy of generator. B should be the kinetic energy of flowing air converted into the mechanical energy of generator, and then converted into electrical energy. C is the potential energy of water converted into the kinetic energy of water converted into the mechanical energy of generator, and then converted into electrical energy. D is the direct conversion of solar energy into electrical energy This problem you see choose it, the teacher judges you wrong, you can be reasonable to earn when the entrance examination will not have this kind of not rigorous topic

A single cylinder four stroke diesel engine, its speed is 800 rpm, the power stroke to push the piston to do 1500 coke, then, the power of this diesel engine is ()
A. 10kW B. 15kw C. 20kW D. 1200kW

The speed of flywheel is 800r / min, ∵ the piston reciprocates twice in one working cycle, the crankshaft rotates for two cycles, the work is done once, ∵ the diesel engine does 400 times of external work in one minute; the total work done by the diesel engine in one minute is w = 400 × 1500j = 6 × 105J, and the power of the diesel engine is p = wt = 6 × 105j60s = 1 × 104w = 10kW

If the two lamps a and B are connected in parallel in the circuit and both light up normally, and the lamp a is brighter than the lamp B, then ()
A. The resistance of a lamp is larger than that of B lamp. B. the voltage applied at both ends of a lamp is larger than that of B lamp. C. The current intensity through a lamp is larger than that of B lamp. D. in the same time, a lamp consumes more electric energy than B lamp

(1) ∵ the voltage at both ends of each branch in the parallel circuit is equal, ∵ when a and B bulbs are parallel, the voltage at both ends is equal, so B is not correct; (2) ∵ the brightness of the bulb depends on the actual power, and a lamp is brighter than B lamp, ∵ the actual power of a lamp is greater than B lamp, ∵ P = UI, ∵ according to I = Pu, we can