Answer:
Assuming they're unit vectors (length of 1)
You simply add them together.
The vector pointing right can be described with X and Y
(1, 0).
The vector pointing down
(0, -1).
The numbers are taken from the axis in X and Y directions.
If you add them together you get a final vector.
(1, - 1)
This gives you -45° pointing South East.
Or 360°-45°=315°
Answer:
1 ) Warm air
2) Cold air
3) Cold water
4) Steel
5) Hot molten
Explanation:
In order to solve this problem, we have to warn that the sound propagates more easily in denser media, in this way we have to identify the densities of the different materials.
Density cold air = 1.2 [kg/m^3]
Density warm air = 1.01 [kg/m^3]
Density cold water = 1000 [kg/m^3]
Density steel = 7500 [kg/m^3]
Density hot molten = 14100 [kg/m^3]
Therefore in order from the slowest to the fastest:
1 ) Warm air
2) Cold air
3) Cold water
4) Steel
5) Hot molten
Answer;
-Science
Explanation;
-Science is a process that involves the collection of information and ideas supported by evidence. Pseudoscience on the other hand, is a process that involves the collection of information and ideas supported by belief or opinion.
-Science is a systematic and logical approach to discovering how things in the universe work. It is also the body of knowledge accumulated through the discoveries about all the things in the universe. Science is based on fact, not opinion or preferences. The process of science is designed to challenge ideas through research. It aims for measurable results through testing and analysis.
Answer:
1 bright fringe every 33 cm.
Explanation:
The formula to calculate the position of the m-th order brigh line (constructive interference) produced by diffraction of light through a diffraction grating is:
where
m is the order of the maximum
is the wavelength of the light
D is the distance of the screen
d is the separation between two adjacent slit
Here we have:
is the wavelength of the light
D = 1 m is the distance of the screen (not given in the problem, so we assume it to be 1 meter)
is the number of lines per mm, so the spacing between two lines is
Therefore, substituting m = 1, we find:
So, on the distant screen, there is 1 bright fringe every 33 cm.
1) We have that temperature naturally flows from areas that are hot to areas that are cold (this is a consequence of the 2nd law of thermodynamics). But this can change if we do not have a closed system, hence if we can change some of the conditions. A good completion would be: is possible only if the system is not closed/we add energy.
2) Air is apoor conductor and sunlight has barely enough concnetrated energy to make a heat pump work adequately. However, all other choices have worked. Hot water is used in several nuclear plant for heat pumps, fires are also used in simple mechanical systems and the ground heat has been used in hydrothermal vents etc.
3) A bimetallic coil is a coil that exemplifies the expansion of metals in the presence of heat and acts like an inaccurate thermometer. Since different metals expand at different speeds, the coil expands unequally when heated and ends up stretching.
4) Out of the 4 choices, refrigeration and coolant are inappropriate choices since they do not refer to release of hit but getting rid of heat. The thermostat also does not burn fuel, it jsut observes temperature. The correct answer is combustion which is defined as a cheical reaction that gives off heat and flame.
5) A heat engine by definitions converts heat into mechanical energy. We have that the only of the choices above that has as a product mechanical energy is the choice with the car, hence this is correct. An air conditioner is a heat pump, not a heat engine.
7) We have that by the law of chemistry, PV=nRT. and that the thermal energy is proportional to T. The pressure cannot increase without stop, so what we have when the temperature (thermal energy) goes up is that the volume also goes up. Hence, the correct answer is that an increase in thermal energy leads to an increase in pressure.
