Answer:
Acceleration (a) is defined as the rate of change of velocity. Velocity is a vector quantity, and therefore acceleration is also a vector quantity. The SI unit of acceleration is metres/second2 (m/s2).
Based on discoveries to date, the conclusion as “Planetary systems are common and planets similar in size to Earth are also common” is justified.
Answer: Option C
<u>Explanation:
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Some studies show that on average, each star has at least single planet. This means that most stars, such as the Solar System, possess planets (otherwise exoplanets). It is known that small planets (more or less Earthly or slightly larger) are more common than giant planets. The mediocrity principles state that planet like Earth should be universal in the universe, while the rare earth hypothesis says they are extremely rare.
Size is often considered an important factor, because planets the size of the Earth are probably more terrestrial and can hold the earth's atmosphere. The planetary system is a series of gravitational celestial objects orbiting a star or galaxy. Generally, planetary systems describe systems with one or more planets, although such systems may also consist of bodies such as dwarf planets, asteroids and the like.
Answer: D)
Explanation:
In a RL circuit, as current can't change instantaneously, it starts from 0, till it reaches to the maximum possible value, according to Ohm's Law, i.e., E/R.
At any time, the current in the circuit (which is the same that passes through the inductor as it's a series circuit) is explained by the following equation:
I = E/R (1 - e-tR/L)
The quotient L/R is called the time constant of the circuit, and defines the time needed for the current reaches to its steady-state value.
If L is larger, the time constant will be larger, and it will take more time to the current to reach to its steady-state value.
Answer:
I think it's Answer A. Because the ball eventually came to a stop, infering that the energy was used up. Hope this helped! :)
Explanation:
Given that,
Mass of the car, m = 710 kg
Speed of the car, v = 23 m/s
Drag force, F = 500 N
(a) Let P is the power is required from the car's engine to drive the car on the level ground. Power is given by :
(b) Let P is the power is required from the car's engine to drive the car on up a hill with a slope of 2 degrees.
At this slope, force will be,
Total force will be :
Power is given by :
or
P = 17 kW