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Because of the earth's_______ The force on an object is called gravity____ All objects near the earth are affected_____ What is the force of gravity______ The object under force is______
Because of the earth's_ Gravitation___ The force on an object is called gravity_ G_ All objects near the earth are affected__ The gravity of the earth_ What is the force of gravity_ Earth__ The object under force is__ Objects____
Length in the United States
Six more "
6 'ft, 6 "in, 1 in = 25.4mm
What does the American unit of length 1 'mean?
There's another one?
What are the Chinese units of length in centimeters?
1 '= 1 foot (foot) = 12 inches (inch) = 30.48 cm
1 "= 1 inch = 2.5399918 cm
For example: Yao Ming's height: 2.26m = 7ft 6in
Is there a formula to calculate the conversion of weight into force?
For example, if I need to lift a 100kg object, how much force do I need to exert? In other words, how can the weight unit be converted into the unit of force?
G=mg
The unit of G force is n
M mass in kg kg
8 N / kg
So the force is always 9.8 times the mass, so 980n is needed
How to convert weight into force
In fact, the weight of an object is not accurate. Right, it can only be said to be mass
The conversion of mass and gravity is based on the formula
G=mg
G is gravity
M is the mass of the object
G stands for the constant of gravitation. The value is usually 9.8n/kg, and 10N / kg for convenience!
What is the unit of weight and stressed area in pressure strength
The unit of pressure is n / m ^ 2
N is the weight * g (g = 9.8n/kg, here the weight unit is also kg)
The unit of stressed area is square meter (m ^ 2)
How does lbs and N translate into units of force
If you think LBS is only a unit of mass, you can ignore this problem
1lb=_ N?
What is density = 62.5 lbs / ft ^ 3 converted into g / cm ^ 3?
According to the attached chart 1, n · M = 8.85 in · lbs, so 60 in · lbs = 60 / 8.85 = 6.779 n · m and kg · M / s are the units of force, not torque, and kg · m is the unit of torque
What does gravity have to do with? What does it change with? What is the object that applies the force?
See Newton's formula for universal gravitation
F=G*M1M2/（R*R） （G=6.67×10^-11N•m^2/kg^2）
F: The attraction between two objects
G: Gravitational constant
M1: mass of object 1
M2: mass of object 2
r: The distance between two objects
The planet's gravity on you is your gravity
Forces interact. If you think of yourself as a force, then the planet is a force giver
If you haven't learned the essence, use G = mg, M is the mass, G is the acceleration of gravity, and the value of G is different in different parts of the earth
Why can the gravity of an object be measured directly with a spring dynamometer?
According to the principle of two force balance, if an object is stationary or moving in a straight line at a constant speed, it will be subject to balance force or no force, but in reality, there is no object without force. Therefore, the object hanging on the dynamometer will be subject to balance force. And because the object is subject to downward gravity and upward tension of the spring sharp instrument in the vertical direction, the tension = gravity, Therefore, the gravity of an object can be measured directly with a spring edge detector
In the experiment, we use a measuring meter to measure the gravity of an object. Please explain the reason from the point of view of the interaction of forces and the balance of the two forces
When an object is hung on the dynamometer, it is under the action of gravity and tensile force; when the object is stationary, it is in a state of force balance. Gravity and tensile force are a pair of balanced forces with equal magnitude and opposite direction, so the reading (tensile force) on the dynamometer is equal to the magnitude of gravity
RELATED INFORMATIONS
- 1. In the laboratory, gravity can be measured with a spring dynamometer. The magnitude of gravity is related to what the object is. What is the specific relationship? What is the expression?
- 2. 500 g of 70% alcohol solution and 300 g of 50% alcohol solution are mixed, and the concentration of alcohol solution is 0______ ．
- 3. How much deionized water does a kilogram of 95% alcohol need to add to make 75% alcohol?
- 4. Mr. Wang has 30 grams of 95% alcohol. How many grams of water should be added to dilute it to 75% alcohol
- 5. In a medical alcohol solution, the mass ratio of pure alcohol to water is 3:4. How many grams of pure alcohol are needed to prepare 420g of this medical alcohol solution?
- 6. The disinfectant alcohol in the hospital is made up of pure alcohol and distilled water in a ratio of 3:1. Now there are 600 grams of pure alcohol. How many grams of distilled water do you need to add?
- 7. How is medical alcohol produced? Is it made of anhydrous ethanol and water?
- 8. How to prepare 75% ethanol solution with 95% ethanol
- 9. Observe the mitosis of plant cells and induce chromosome doubling at low temperature Both experiments used plant cells But why is it unnecessary to add Karnaugh's solution to observe mitosis? What's the difference between these two experiments? What should we pay attention to?
- 10. Observe the loading process of plant cell mitosis experiment
- 11. What does GM stand for (a unit of weight or a unit of volume) Dosage: 0.1gm/part
- 12. A rectangular cylinder cone of equal base area and volume, the longest of which is Give reasons
- 13. The circumference of the bottom surface of a cylinder is 62.8 cm and the height is 30 cm. If the cylinder is cut into the largest cuboid, what is the volume of the cuboid
- 14. There is a rectangular container and a cylindrical container. The ratio of their bottom area is 5:3. There is 3744 cubic decimeters of water in the rectangular container, and the water depth is 14.4 decimeters The cylinder is empty. Now pour the same amount of water into the rectangular container and the cylindrical container to make the water depth in the two containers equal. This is the water depth of the rectangular container
- 15. How to calculate the volume of pipeline insulation material
- 16. An iron cylinder with a mass of 5 kg, 20 cm high, and a density of 7.8 × 10 ^ 3 kg / m2 Find (1) how much pressure does the table face when it is placed vertically on a horizontal table top? (2) how much pressure does the table face when it is pressed down with Newton's force?
- 17. How to calculate the weight of water The fish tank is 0.78 meters long, 0.38 meters wide and 0.45 meters high. Who can help me figure out how much water I can hold
- 18. A rectangular steel plate weighs 128.7 kg, 2.2 meters long and 1.5 meters wide. Each cubic decimeter of steel weighs 7.8 kg. How many decimeters thick is this steel plate?
- 19. The volume of water increases by one tenth after ice formation. How many cubic decimeters is the volume of a 143 square decimeter piece of water after ice formation
- 20. Ice water turns into water, and its volume is reduced by 1 / 11. Now there is 5 cubic decimeters of water. When it forms ice, what is its volume? A 5 cubic decimeter of ice How many cubic decimeters is the volume of water