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Question and answer for the fun physics competition
I. Part of the response to the question
+100
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, the following statement is wrong:
The sound is generated by the vibration of the object
... The transmission of sound requires media, and the vacuum does not transmit sound
... Sound size determined by the frequency of vibration
... With acoustic and electromagnetic waves
Xiao hua is here
2008
In the annual exam, the height of the physical examination is as follows:
160
Xiaohua's height should be recorded as
160m b
160 and c
160dm d
160 mm
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The sound spreads at the same speed in different media
If the tone and sound are the same, we can't tell the sound
As long as the object is vibrating, we can hear it
And everything that sounds is vibrating
The projector has been widely used in modern teaching, and the projector's lens is equivalent to a fibrous cam. Twilight
Mirror, the following statement is correct:
No matter how far it may go, the cam lenses can be clear
The image of the projector can be either an image or an image
To make the projector more visible, the projector's camera is closer to the slide
The magnifier is a camcorder. It has the same characteristics as the projector
, regarding molecular kinetic theory and inner energy, the following is correct:
One bucket of water is bigger than the heat
A solar water heater absorbs solar energy to increase the temperature of water by working to change the water inside. Yes
... The internal energy of the object is related to the speed of the object, the greater the speed of the object, the greater the internal energy of the object
The phenomenon of proliferation is not only an indication of the constant movement of molecules, but also of the gaps between molecules
2008
The year's beijing olympic games advocate for the green olympics
The following is an environmental symbol of the beijing olympics
It represents the harmony between man and nature. Among the following practices that do not conform to the concept of “green olympics”:
Increased number of motor vehicles and improved access
Increased water pollution prevention and protection of drinking water sources
Minimize the use of disposable wood chopsticks, napkins, plastic bags, etc
... Restructuring energy and introducing non- and low-pollution energy
Add it horizontally on both sides of the spring meter
4n
Pull it and keep it still
Yes
0n b
2n c
4n d
8n
The water-jumping campaign is the official olympic games project, in which our athletes have been internationally leading. That's right
It's a game
A diver jumps up from the sky and then falls down into the water
If you don't count air resistance
It's all over the air
In the movement, the athletes
... With reduced kinetic energy, increased gravity, reduced mechanical power
Increased kinetic energy, reduced gravity, increased mechanical energy
... A reduction in kinetic energy, a decrease in gravity, and an increase in machinery
... To increase and reduce kinetic energy, to reduce gravity and to reduce machinery
9.
The increase in hydrogen balloons will be:
