Answer:
1. The law of equal areas suggests that the imaginary line connecting the Sun to a planet sweeps out equal areas in equal amounts of time.
Explanation:
This statement correctly describes Kepler's 2nd law of planetary motion. The three Kepler laws of planetary motion are:
1st law: the orbits of the planets around the Sun are ellipses, with the Sun at one of the two focii
2nd law: an imaginary line connecting the Sun to a planet sweeps out equal areas in equal amounts of time
3rd law: the cube of the average distance of a planet from the Sun is proportional to the square of the orbital period of the planet
As we can see, the 2nd law corresponds to the first statement described in the question. Also, a result of this law is that the speed of a planet decreases as the planet moves farther from the Sun, while its speed is higher when the planet is close to the Sun.
Answer:
(a)
(b)
Explanation:
(a)
Minimum power to maintain desired temperature is given by
(b)
Efficiency of heat engine
Converting temperature to Kelvin
T1=31 degrees=31+273=304 K
T2=500 degree=500+273=773
Considering required output of then the power needed to be supplied by the solar collector to heat engine is given by
The answer is longitudinal. There are two types of waves: transverse and longitudinal. Transverse waves are those whose vibrations are perpendicular to the direction of the wave. Longitudinal or compression waves are those whose vibrations are in the same direction as the wave. Sound is caused by the compression of vibrations of molecules.
Answer:
Yes
Explanation:
Yes, bluetooth devices work in a frequency range between 2.4 - 2.485GHz. Outside this frequency the devices will not communicate with each other correctly. This frequency equals a wavelength of around 1cm. Therefore, any change in the amplitude or wavelength would need to be in relation to each other in order to maintain the frequency in the required range for the bluetooth device to work accordingly. If one increases while the other remains the same it can easily change the frequency to outside the range.