1. In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:___________ In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:______________________ ,___________________ ,_____________ The expression of power is_________ . 2. As shown in the figure, it takes 100 seconds for Xiao Ming to ride a bicycle 600 meters in front of a uniform speed on a straight road, from which the speed of the bicycle can be calculated___ Assuming that the resistance of the bicycle is 60N, the power of Xiaoming's work during the journey is______ w. The physical formula used to solve the problem is as follows_________________________________________ Try to deduce the expression of the relationship between power and speed_________________________________________

1. In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:___________ In order to compare the power of rope skipping in the class rope skipping competition, which physical quantities must be measured in the activity are as follows:______________________ ,___________________ ,_____________ The expression of power is_________ . 2. As shown in the figure, it takes 100 seconds for Xiao Ming to ride a bicycle 600 meters in front of a uniform speed on a straight road, from which the speed of the bicycle can be calculated___ Assuming that the resistance of the bicycle is 60N, the power of Xiaoming's work during the journey is______ w. The physical formula used to solve the problem is as follows_________________________________________ Try to deduce the expression of the relationship between power and speed_________________________________________

Must measure:
Human mass m, height h, time t (also can measure 10 or more times)
Expression: P = MGH / T
6m/s、360W
Physical formula: P = w / T = FS / T
Derivation: P = w / T = FS / T = f × s / T = FV

To measure the mechanical efficiency of the inclined plane, it is required to write the physical quantity that the experimental equipment needs to measure, and the mechanical efficiency of the experimental steps
Mechanical efficiency of inclinometer
It is required to write: (1) experimental equipment; (2) physical quantity to be measured; (3) experimental steps; (4) expression of mechanical efficiency; (5) design experimental table

1) Small block one, board, spring dynamometer, small block two
2) G Block H F Las
3) According to w = GH, we get the useful work
W = fs to get the total work
Mechanical efficiency = active work / total work

Xiao Ming wants to know his own mass. Can he measure it with a spring dynamometer with a measuring range of 50N? Auxiliary equipment: the experimental method includes physical quantity and gravity expression
Xiao Ming wants to know his mass. Can he measure it with a spring dynamometer with a measuring range of 50N?
1. Auxiliary equipment required
2. The method of experiment, including which physical quantities should be measured, the expression of gravity, etc. (if necessary, drawings can be drawn to help explain)
The winter vacation is almost over. This is winter vacation homework. Let's give some awesome answers.
In addition, chemistry has an experiment on rust of iron nails, copper blocks and aluminum blocks. I'd like to ask you how to do it
Points are not a problem
The first question about Xiao Ming's weight measurement, please be more specific. I don't quite understand that,
Explain the steps clearly, such as what to use and how to use
This chemical experiment is just about how to do it. I have to do it myself.

If you want to use the lever principle, the moment ratio is equal to the inverse ratio of the force, you can measure the weight of a person at 50N, or you can use a large balance, and then use a small stone (below 50N) to fall flat to measure the weight of a person
1) Lever means that a small force on the long end can pull a large force on the short end

In order to study the relationship between gravity and mass, what physical quantities should be measured, what measuring tools should be used, and what experimental equipment should be used

The relationship between gravity and mass of an object depends on the acceleration of gravity at the measuring point
Measuring tools: balance, spring scale, etc