Answer:
Explanation:
velocity of the Escalators is given as 6 ft/s
now we know that Jane steps on parallel escalator after t = 5 s
so distance moved by John in same time interval is given as
now John and Jane will move towards each other with relative speed
Then will approach towards each other with this relative speed and meet after t = 15 s
so the distance moved by them
so total length of the escalators is given as
In rutherford experiment he bombarded highly energetic alpha particles towards the gold foil
He observed that most of the alpha particles pass through the foil without any deviation while very few of the alpha particles are there which reflect back to its own path
while very less in number was there which were deflected from there path
so he concluded that the positive charge of atom is concentrated inside the nucleus and it is small space in tom and electrons are surrounded them
so correct answer would be
4. In an atom, most of the mass and the positive charge are located in a small core within the atom called the nucleus.
Answer:
Vd = 0.022 (V)
Explanation:
What we have as voltage drop is the difference between the voltage at source level (terminals) and the voltage at the terminal of electrical load ( in this case the toaster oven) that difference occures as consequence of the normal distributed resistance of conductor. But the voltage at the terminal of the electric load have to be measure between the two wires at the end of the circuit.
Therefore the voltage drop is = I*R = 11 (A) * 0,002 Ω = 0.022 (v)
Answer:
Average speed: 0.5 m/s. Average velocity: 0
Explanation:
Average speed is given by:
where
d is the total distance covered (the length, of one lap of the track, so d = 400 m)
t is the time taken to cover that distance (so, t = 800 s)
Substituting,
Instead, average velocity is defined as
where this time,
d is the displacement, which is the vector connecting the starting point to the final point of the motion
t is still the time taken (800 s)
However, in this case the walker starts and finishes his trip at the same point: therefore, the displacement is zero (d=0), and this means that the average velocity is zero as well.
A radioactive isotope will release alpha particles and become more stable, and becomes a different element.