Answer:
1 False. Atoms can be divided, see case of radioactive materials
Explanation:
Dalton's theory says that matter is made up of very small particles called atoms that are indivisible and cannot be destroyed, chemical compounds are made up of atoms.
With this statement, we can review the proposals,
1 False. Atoms can be divided, see case of radioactive materials
2 True. Chemical reactions are performed by atoms.
3 True. This statement remains unchanged.
4 True. The compound or molecules are formed by atoms
Answer:
minimum two photogate
Explanation:
The photogate allows us to activate the measurement of time, so we must place at least two of them, one at the beginning of the movement to measure the initial time and another at the end of the movement to measure the final time, of course we must have measured the distance. This gives us the average speed between the two photocells
For measurements with more changes curves, slopes, one photogate must be placed at the beginning of the curve or slope and another at the end.
Answer:
<h2> $1.50</h2>
Explanation:
Given data
power P= 2 kW
time t= 15 min to hours = 15/60= 1/4 h
cost of power consumption per kWh= 10 cent = $0.1
We are expected to compute the cost of operating the heater for 30 days
but let us computer the energy consumption for one day
Energy of heater for one day= 2* 1/4 = 0.5 kWh
the cost of operating the heater for 30 days= 0.5*0.1*30= $1.50
<u><em>Hence it will cost $1.50 for 30 days operation</em></u>
Answer:
The Answer Is A,C,D
Explanation:
The gravitational pull from the moon make bigger waves'
There would be no moon for eclipses
There would be more sun and no moon