-
Anonymous users2024-02-07There seems to be only 1 question on 33 pages.
14.p. B34.
5.Minish. 6.The contact surface is smoother, reducing the friction between the shoe and the ground.
7.Decrease Increase the roughness of the contact surface and increase the friction with the ground.
8.Frictional force.
-
Anonymous users2024-02-0617.Scale bars, directions, legends, and annotations.
19.Polaris.
20.Sun Mercury.
21.Equator: Zero to 30 degrees east longitude 160 degrees east longitude, 20 degrees west longitude.
Antarctica: 90 degrees, 30 to 60 degrees, 160 degrees east longitude, 20 degrees west longitude.
North Pole: 90 degrees 60 degrees to 90 degrees 0 degrees.
Southern Hemisphere: 0 to 90 degrees Celsius
Northern Hemisphere: 0 to 90 degrees N
22.(1) The first day of the new moon, the seventh and eighth days of the first quarter of the first quarter, the fifteenth and sixteenth full moons, and the twenty-second of the second quarter moon. Twenty-three.
2) A is painted, B is changed to the right half, D is left half...3) Cycle synodism.
4）a c23.(1) Far.
2) A: There are red rocks everywhere. The red dust was blown by the wind like thick clouds.
3) A: Mars is farther from the Sun than from Earth. The atmosphere is thin and the thermal insulation performance is poor.
4) A: Mars has an atmosphere, the Moon does not.
5) A: The air is thin, low temperature, hypoxic, and cannot resist ultraviolet rays.
-
Anonymous users2024-02-05A Review Questions Answers:
13.Melt and solidify.
14.Evaporation Boiling Liquid temperature Liquid surface area size Air flow above liquid surface fast Refrigeration Suction Remains unchanged Boiling point.
15.Particulate void temperature.
17.Sublimation, thermal condensation, liquefaction.
19.Left 52 to the third power.
20.(1) omitted (2).
21.(1) 98 (2) more than (3) can not be kept in the experiment without keeping both masses and elevated temperatures the same.
Kilogram 23(1) Specific heat capacity (2) d (3) b (4) slightly.
-
Anonymous users2024-02-04Review question answers:
13.Melt and solidify.
14.Evaporation Boiling Liquid temperature Liquid surface area size Air flow above liquid surface fast Refrigeration Suction Remains unchanged Boiling point.
15.Particulate void temperature.
17.Sublimation, thermal condensation, liquefaction.
19.Left 52 to the third power.
20.(1) omitted (2).
21.(1) 98 (2) more than (3) can not be kept in the experiment without keeping both masses and elevated temperatures the same.
Kilogram 23(1) Specific heat capacity (2) d (3) b (4) slightly.
-
Anonymous users2024-02-0317.Scale bars, directions, legends, and annotations.
19.Polaris.
20.Sun Mercury.
21.Equator: Zero degrees to 30 degrees east longitude 160 degrees east longitude and 20 degrees west longitude.
Antarctica: 90 degrees, 30 to 60 degrees, 160 degrees east longitude, 20 degrees west longitude.
North Pole: 90 degrees 60 degrees to 90 degrees 0 degrees.
Southern Hemisphere Difference: 0 to 90 degrees Celsius
Northern Hemisphere: 0 to 90 degrees N
22.(1) The first day of the new moon, the seventh and eighth days of the first quarter of the first quarter, the fifteenth and sixteenth full moons, and the twenty-second of the second quarter moon. 2. Natoshi XIII.
2）.Slightly (can't play).
3) Cycle synodism.
4）a c23.(1) Far.
2) A: There are red rocks everywhere. The red dust was blown by the wind like thick clouds.
3) A: Mars is farther from the Sun than from Earth. The atmosphere is thin and the thermal insulation performance is poor.
4) A: Mars has an atmosphere, the Moon does not.
5) A: The air is thin, low temperature, hypoxic, and cannot resist ultraviolet rays.
-
Anonymous users2024-02-021.The color of the tiny particles of hematite or hematite.
2.Because they are farther from the Sun than the Earth, Venus and Mercury are much warmer than the Earth.
3.There are a lot of dry riverbeds on Mars that the Moon does not.
4.There is no atmosphere on the surface of the moon, there are many craters, there is no atmosphere so sunlight does not scatter, so the sky is dark;
The surface of Mars has an atmosphere, which is weathered, and the surface is rich in iron oxide, so the surface is red.
5.Problem 1: Arrive at your destination. Scientists also need to minimize the time it takes for astronauts to arrive on Mars while avoiding excessive radiation exposure in the process.
Problem 2: Radiation problem. Solar "storms" and cosmic ray "storms" often last for several days, and if astronauts are exposed to rays at that time, their bodies are vulnerable to damage.
Problem 3: The air you breathe. One of the most important ways to maintain air quality is to establish a circulation system that removes exhaust gases such as carbon dioxide. In addition, scientists are studying how to extract minerals from the moon and Mars to make oxygen.
Problem 4: Sufficient food. If they are to go on a long trip to Mars or live on a lunar base for an extended period of time, astronauts must learn to "produce" most of the food they need in space, such as growing vegetables in greenhouses.
Problem 5: Waste recycling. Dealing with human waste and other waste can be tricky during space travel.
Problem 6: Sufficient drinking water. Scientists have already discovered raw materials in the permafrost zone at the moon's poles in 1998 that can be processed into water, and are currently exploring whether there is a similar resource on Mars.
Challenge 7: Stay connected in real time. Due to the long distance between Earth and Mars, it takes at least 20 minutes for radio signals to be transmitted between the two planets, so that in the event of an emergency, astronauts will not be able to get help from the Earth's control center in time.
Problem 8: Living in microgravity. Astronauts who live on the space station for a long time will experience muscle relaxation or bone lightness. Scientists are currently looking for ways to improve various space workout equipment to ensure that astronauts' muscles do not relax.
Problem 9: Rapid changes in temperature. The temperature difference between the surface of the Moon and Mars is enormous. For astronauts who want to live on a lunar base for a long time and for an expedition to Mars, a stable working and living environment is essential.
Problem 10: Energy demand. The usual solution is to use solar panels, but their stability is still a concern.
-
Anonymous users2024-02-01Solve equation (2x+a) (x-2)= 1
2x+a)/(2-x)= 1
2x+a=2-x
x=(2-a)/3>0
So a<2
To make the question meaningful, then x is not equal to 2 (the denominator is not zero), so x cannot be 2, because a=-4 when x=2
So the solution a is not equal to -4
Buy directly the question analysis with the answer.
You better don't copy it, it's useless to copy it, it's better not to do it!!
d I'm not very sure about this question Go back and flip through the biology book There must be a detailed explanation I only deducted two points for the biology college entrance examination The reason is that I copied the book three times before the college entrance examination Copy word for word and copy the picture well. >>>More
Gemini has two very bright stars, and in the west these two stars symbolize the pair of twin brothers named Gemini. One of the fainter stars (Beihe-2) is a binary star in a telescope (in fact, it is even a sextinct star). The other stars are fainter. >>>More
The divisor of 18 is 1,18,2,9,3,6 The divisor of 27 is 1,27,3,9 The greatest common divisor is 9 >>>More